diff --git a/apps/member/views.py b/apps/member/views.py
index a3bcf93..98aa7b5 100644
--- a/apps/member/views.py
+++ b/apps/member/views.py
@@ -77,10 +77,18 @@ class AddTeamView(LoginRequiredMixin, CreateView):
     form_class = TeamForm
 
     def form_valid(self, form):
+        if self.request.user.organizes:
+            form.add_error('name', _("You can't organize and participate at the same time."))
+            return self.form_invalid(form)
+
+        if self.request.user.team:
+            form.add_error('name', _("You are already in a team."))
+            return self.form_invalid(form)
+
         team = form.instance
         alphabet = "0123456789abcdefghijklmnopqrstuvwxyz0123456789"
         code = ""
-        for _ in range(6):
+        for i in range(6):
             code += random.choice(alphabet)
         team.access_code = code
         team.validation_status = "0invalid"
@@ -104,6 +112,23 @@ class JoinTeamView(LoginRequiredMixin, FormView):
 
     def form_valid(self, form):
         team = form.cleaned_data["team"]
+
+        if self.request.user.organizes:
+            form.add_error('access_code', _("You can't organize and participate at the same time."))
+            return self.form_invalid(form)
+
+        if self.request.user.team:
+            form.add_error('access_code', _("You are already in a team."))
+            return self.form_invalid(form)
+
+        if self.request.user.role == '2coach' and team.encadrants.size() == 3:
+            form.add_error('access_code', _("This team is full of coachs."))
+            return self.form_invalid(form)
+
+        if self.request.user.role == '3participant' and team.participants.size() == 5:
+            form.add_error('access_code', _("This team is full of participants."))
+            return self.form_invalid(form)
+
         self.request.user.team = team
         self.request.user.save()
         return super().form_valid(form)
diff --git a/apps/tournament/forms.py b/apps/tournament/forms.py
index f5feba7..2e50b64 100644
--- a/apps/tournament/forms.py
+++ b/apps/tournament/forms.py
@@ -1,3 +1,7 @@
+import os
+import re
+from datetime import datetime
+
 from django import forms
 from django.utils.translation import gettext_lazy as _
 
@@ -7,6 +11,17 @@ from tournament.models import Tournament, Team
 
 
 class TournamentForm(forms.ModelForm):
+    def clean(self):
+        cleaned_data = super().clean()
+
+        if not self.instance.pk:
+            if Tournament.objects.filter(name=cleaned_data["data"], year=os.getenv("TFJM_YEAR")):
+                self.add_error("name", _("This tournament already exists."))
+            if cleaned_data["final"] and Tournament.objects.filter(final=True, year=os.getenv("TFJM_YEAR")):
+                self.add_error("name", _("The final tournament was already defined."))
+
+        return cleaned_data
+
     class Meta:
         model = Tournament
         fields = '__all__'
@@ -25,6 +40,14 @@ class OrganizerForm(forms.ModelForm):
         model = TFJMUser
         fields = ('last_name', 'first_name', 'email', 'is_superuser',)
 
+    def clean(self):
+        cleaned_data = super().clean()
+
+        if TFJMUser.objects.filter(email=cleaned_data["email"], year=os.getenv("TFJM_YEAR")).exists():
+            self.add_error("trigram", _("This organizer already exist."))
+
+        return cleaned_data
+
     def save(self, commit=True):
         user = self.instance
         user.role = '0admin' if user.is_superuser else '1organizer'
@@ -32,10 +55,34 @@ class OrganizerForm(forms.ModelForm):
 
 
 class TeamForm(forms.ModelForm):
+    tournament = forms.ModelChoiceField(
+        Tournament.objects.filter(date_inscription__gte=datetime.today(), final=False),
+    )
+
     class Meta:
         model = Team
         fields = ('name', 'trigram', 'tournament',)
 
+    def clean(self):
+        cleaned_data = super().clean()
+
+        cleaned_data["trigram"] = cleaned_data["trigram"].upper()
+
+        if not re.match("[A-Z]{3}", cleaned_data["trigram"]):
+            self.add_error("trigram", _("The trigram must be composed of three upcase letters."))
+
+        if not self.instance.pk:
+            if Team.objects.filter(trigram=cleaned_data["trigram"], year=os.getenv("TFJM_YEAR")).exists():
+                self.add_error("trigram", _("This trigram is already used."))
+
+            if Team.objects.filter(name=cleaned_data["name"], year=os.getenv("TFJM_YEAR")).exists():
+                self.add_error("name", _("This name is already used."))
+
+            if cleaned_data["tournament"].date_inscription < datetime.today():
+                self.add_error("tournament", _("This tournament is already closed."))
+
+        return cleaned_data
+
 
 class JoinTeam(forms.Form):
     access_code = forms.CharField(
@@ -46,10 +93,16 @@ class JoinTeam(forms.Form):
     def clean(self):
         cleaned_data = super().clean()
 
+        if not re.match("[a-z0-9]{6}", cleaned_data["access_code"]):
+            self.add_error('access_code', _("The access code must be composed of 6 alphanumeric characters."))
+
         team = Team.objects.filter(access_code=cleaned_data["access_code"])
         if not team.exists():
             self.add_error('access_code', _("This access code is invalid."))
-        cleaned_data["team"] = team.get()
+        team = team.get()
+        if not team.invalid:
+            self.add_error('access_code', _("The team is already validated."))
+        cleaned_data["team"] = team
 
         return cleaned_data
 
diff --git a/apps/tournament/models.py b/apps/tournament/models.py
index 0e432e1..bef6e5c 100644
--- a/apps/tournament/models.py
+++ b/apps/tournament/models.py
@@ -1,5 +1,5 @@
 import os
-from datetime import date
+from datetime import date, datetime
 
 from django.db import models
 from django.urls import reverse_lazy
@@ -36,23 +36,38 @@ class Tournament(models.Model):
     )
 
     date_start = models.DateField(
+        default=datetime.today,
         verbose_name=_("date start"),
     )
 
     date_end = models.DateField(
+        default=datetime.today,
         verbose_name=_("date end"),
     )
 
     date_inscription = models.DateTimeField(
+        default=datetime.now,
         verbose_name=_("date of registration closing"),
     )
 
     date_solutions = models.DateTimeField(
+        default=datetime.now,
         verbose_name=_("date of maximal solution submission"),
     )
 
     date_syntheses = models.DateTimeField(
-        verbose_name=_("date of maximal syntheses submission"),
+        default=datetime.now,
+        verbose_name=_("date of maximal syntheses submission for the first round"),
+    )
+
+    date_solutions_2 = models.DateTimeField(
+        default=datetime.now,
+        verbose_name=_("date when solutions of round 2 are available"),
+    )
+
+    date_syntheses_2 = models.DateTimeField(
+        default=datetime.now,
+        verbose_name=_("date of maximal syntheses submission for the second round"),
     )
 
     final = models.BooleanField(
@@ -172,6 +187,11 @@ class Team(models.Model):
         return ['<a href="{url}">'.format(url=reverse_lazy("member:information", args=(user.pk,))) + str(user) + '</a>'
                 for user in self.participants]
 
+    @property
+    def can_validate(self):
+        # TODO In a normal time, team needs a motivation letter and authorizations.
+        return self.encadrants.exists() and self.participants.count() >= 4
+
     class Meta:
         verbose_name = _("team")
         verbose_name_plural = _("teams")
diff --git a/apps/tournament/views.py b/apps/tournament/views.py
index d4499d4..c19cdbb 100644
--- a/apps/tournament/views.py
+++ b/apps/tournament/views.py
@@ -1,5 +1,6 @@
 import random
 import zipfile
+from datetime import datetime
 from io import BytesIO
 
 from django.contrib.auth.mixins import LoginRequiredMixin
@@ -21,21 +22,21 @@ from .tables import TournamentTable, TeamTable, SolutionTable, SynthesisTable
 
 class AdminMixin(LoginRequiredMixin):
     def dispatch(self, request, *args, **kwargs):
-        if not request.user.admin:
+        if not request.user.is_authenticated or not request.user.admin:
             raise PermissionDenied
         return super().dispatch(request, *args, **kwargs)
 
 
 class OrgaMixin(LoginRequiredMixin):
     def dispatch(self, request, *args, **kwargs):
-        if not request.user.organizes:
+        if not request.user.is_authenticated or not request.user.organizes:
             raise PermissionDenied
         return super().dispatch(request, *args, **kwargs)
 
 
 class TeamMixin(LoginRequiredMixin):
     def dispatch(self, request, *args, **kwargs):
-        if not request.user.team:
+        if not request.user.is_authenticated or not request.user.team:
             raise PermissionDenied
         return super().dispatch(request, *args, **kwargs)
 
@@ -105,12 +106,14 @@ class TeamDetailView(LoginRequiredMixin, DetailView):
     model = Team
 
     def dispatch(self, request, *args, **kwargs):
-        if not request.user.admin and self.request.user not in self.get_object().tournament.organizers.all()\
-                and self.get_object() != request.user.team:
+        if not request.user.is_authenticated or \
+                (not request.user.admin and self.request.user not in self.get_object().tournament.organizers.all()
+                 and self.get_object() != request.user.team):
             raise PermissionDenied
         return super().dispatch(request, *args, **kwargs)
 
     def post(self, request, *args, **kwargs):
+        print(request.POST)
         team = self.get_object()
         if "zip" in request.POST:
             solutions = team.solutions.all()
@@ -128,13 +131,28 @@ class TeamDetailView(LoginRequiredMixin, DetailView):
                 .format(_("Solutions for team {team}.zip")
                         .format(team=str(team)).replace(" ", "%20"))
             return resp
-        elif "leave" in request.POST:
+        elif "leave" in request.POST and request.user.participates:
             request.user.team = None
             request.user.save()
             if not team.users.exists():
                 team.delete()
             return redirect('tournament:detail', pk=team.tournament.pk)
-        elif "delete" in request.POST:
+        elif "request_validation" in request.POST and request.user.participates:
+            team.validation_status = "1waiting"
+            team.save()
+            # TODO Send mail
+            return redirect('tournament:team_detail', pk=team.pk)
+        elif "validate" in request.POST and request.user.organizes:
+            team.validation_status = "2valid"
+            team.save()
+            # TODO Send mail
+            return redirect('tournament:team_detail', pk=team.pk)
+        elif "invalidate" in request.POST and request.user.organizes:
+            team.validation_status = "0invalid"
+            team.save()
+            # TODO Send mail
+            return redirect('tournament:team_detail', pk=team.pk)
+        elif "delete" in request.POST and request.user.organizes:
             team.delete()
             return redirect('tournament:detail', pk=team.tournament.pk)
 
@@ -204,12 +222,18 @@ class SolutionsView(TeamMixin, BaseFormView, SingleTableView):
         solution = form.instance
         solution.team = self.request.user.team
         solution.final = solution.team.selected_for_final
+
+        if datetime.now() > solution.tournament.date_solutions:
+            form.add_error('file', _("You can't publish your solution anymore. Deadline: {date:%m-%d-%Y %h:%M}.")
+                           .format(date=solution.tournament.date_solutions))
+            return super().form_invalid(form)
+
         prev_sol = Solution.objects.filter(problem=solution.problem, team=solution.team, final=solution.final)
         for sol in prev_sol.all():
             sol.delete()
         alphabet = "0123456789abcdefghijklmnopqrstuvwxyz0123456789"
         id = ""
-        for _ in range(64):
+        for i in range(64):
             id += random.choice(alphabet)
         solution.file.name = id
         solution.save()
@@ -302,13 +326,26 @@ class SynthesesView(TeamMixin, BaseFormView, SingleTableView):
         synthesis = form.instance
         synthesis.team = self.request.user.team
         synthesis.final = synthesis.team.selected_for_final
+
+        if synthesis.round == '1' and datetime.now() > synthesis.tournament.date_syntheses:
+            form.add_error('file', _("You can't publish your synthesis anymore for the first round."
+                                     " Deadline: {date:%m-%d-%Y %h:%M}.")
+                           .format(date=synthesis.tournament.date_syntheses))
+            return super().form_invalid(form)
+
+        if synthesis.round == '2' and datetime.now() > synthesis.tournament.date_syntheses_2:
+            form.add_error('file', _("You can't publish your synthesis anymore for the second round."
+                                     " Deadline: {date:%m-%d-%Y %h:%M}.")
+                           .format(date=synthesis.tournament.date_syntheses_2))
+            return super().form_invalid(form)
+
         prev_syn = Synthesis.objects.filter(team=synthesis.team, round=synthesis.round, source=synthesis.source,
                                             final=synthesis.final)
         for syn in prev_syn.all():
             syn.delete()
         alphabet = "0123456789abcdefghijklmnopqrstuvwxyz0123456789"
         id = ""
-        for _ in range(64):
+        for i in range(64):
             id += random.choice(alphabet)
         synthesis.file.name = id
         synthesis.save()
diff --git a/templates/tournament/team_detail.html b/templates/tournament/team_detail.html
index cd08882..9e23910 100644
--- a/templates/tournament/team_detail.html
+++ b/templates/tournament/team_detail.html
@@ -51,6 +51,60 @@
         {% endif %}
     </div>
 
+    {% if user.participates and team.invalid %}
+        <hr>
+        {% if team.can_validate %}
+            <form method="post">
+                {% csrf_token %}
+                <label for="engage">Je m'engage à participer à l'intégralité du TFJM²*</label>
+                <input type="checkbox" name="engage" id="engage" required/>
+                <div class="alert alert-warning">
+                    <strong>Attention !</strong> Une fois votre équipe validée, vous ne pourrez plus modifier le nom
+                    de l'équipe, le trigramme ou la composition de l'équipe.
+                </div>
+                <input class="btn btn-success btn-block" type="submit" name="request_validation"
+                       value="Demander la validation"/>
+            </form>
+        {% else %}
+            <div class="alert alert-warning">
+                Pour demander à valider votre équipe, vous devez avoir au moins un encadrant, quatre participants
+                et soumis une autorisation de droit à l'image, une fiche sanitaire et une autorisation
+                parentale (si besoin) par participant, ainsi qu'une lettre de motivation à transmettre aux organisateurs.
+                Les encadrants doivent également fournir une autorisation de droit à l'image.
+            </div>
+        {% endif %}
+        <hr>
+        <div class="alert alert-danger">
+            En raison du changement de format du TFJM² 2020, il n'y a plus de document obligatoire à envoyer. Les autorisations
+            précédemment envoyées ont été détruites. Seules les lettres de motivation ont été conservées, mais leur envoi
+            n'est plus obligatoire.
+        </div>
+    {% endif %}
+
+    {% if team.waiting %}
+        <hr>
+        <div class="alert alert-warning">
+        {% trans "The team is waiting about validation." %}
+        </div>
+
+        {% if user.admin %}
+            <form method="POST">
+                {% csrf_token %}
+                <div class="form-group row">
+                    <label for="message">{% trans "Message addressed to the team:" %}</label>
+                    <textarea class="form-control" id="message" name="message" placeholder="{% trans "Message..." %}"></textarea>
+                </div>
+
+                <div class="form-group">
+                    <div class="btn-group btn-block">
+                        <button class="btn btn-danger" name="invalidate">{% trans "Invalidate team" %}</button>
+                        <button class="btn btn-success" name="validate">{% trans "Validate team" %}</button>
+                    </div>
+                </div>
+            </form>
+        {% endif %}
+    {% endif %}
+
     <hr>
 
     <h4>{% trans "Documents" %}</h4>