diff --git a/tournaments/models/tournament.py b/tournaments/models/tournament.py
index d90484f..ee0876d 100644
--- a/tournaments/models/tournament.py
+++ b/tournaments/models/tournament.py
@@ -260,6 +260,56 @@ class Tournament(models.Model):
         matches.sort(key=lambda m: m.start_date, reverse=True)
         return matches
 
+    def display_summons(self):
+        if self.end_date is not None:
+            return False
+        if self.publish_summons:
+            return True
+        if timezone.now().date() >= self.start_date.date():
+            return True
+        return False
+
+    def display_group_stages(self):
+        if len(self.groupstage_set.all()) == 0:
+            return False
+        if self.publish_group_stages:
+            return True
+
+        first_group_stage_start_date = self.group_stage_start_date()
+        if first_group_stage_start_date is None:
+            return False
+        elif timezone.now().date() >= first_group_stage_start_date.date():
+            return True
+        return False
+
+    def group_stage_start_date(self):
+        group_stages = [gs for gs in self.groupstage_set.all() if gs.start_date is not None]
+        return min(group_stages, key=lambda gs: gs.start_date).start_date
+
+    def display_matches(self):
+        bracket_matches = self.bracket_matches()
+        if len(bracket_matches) == 0:
+            return False
+        if self.publish_brackets:
+            return True
+
+        first_match_start_date = self.first_match_start_date(bracket_matches)
+        if first_match_start_date is None:
+            return False
+        elif timezone.now().date() >= first_match_start_date.date():
+            return True
+        return False
+
+    def bracket_matches(self):
+        matches = []
+        for round in self.round_set.all():
+            matches.extend(round.all_matches(False))
+        return matches
+
+    def first_match_start_date(self, bracket_matches):
+        matches = [m for m in bracket_matches if m.start_date is not None]
+        return min(matches, key=lambda m: m.start_date).start_date
+
 class MatchGroup:
     def __init__(self, name, matches):
         self.name = name
diff --git a/tournaments/templates/tournaments/navigation_tournament.html b/tournaments/templates/tournaments/navigation_tournament.html
index b6ef57f..f18083e 100644
--- a/tournaments/templates/tournaments/navigation_tournament.html
+++ b/tournaments/templates/tournaments/navigation_tournament.html
@@ -1,10 +1,14 @@
+<nav class="margin10">
+    {% if tournament.display_matches %}
+    <a href="{% url 'tournament' tournament.id %}" class="mybox">Matches</a>
+    {% endif %}
 
-        <nav class="margin10">
-            <a href="{% url 'tournament' tournament.id %}" class="mybox">Matches</a>
-            <a href="{% url 'group-stages' tournament.id %}" class="mybox">Poules</a>
+    {% if tournament.display_group_stages %}
+    <a href="{% url 'group-stages' tournament.id %}" class="mybox">Poules</a>
+    {% endif %}
 
-            {% if tournament.in_progress %}
-            <a href="{% url 'tournament-summons' tournament.id %}" class="mybox">Convocations</a>
-            {% endif %}
+    {% if tournament.display_summons %}
+    <a href="{% url 'tournament-summons' tournament.id %}" class="mybox">Convocations</a>
+    {% endif %}
 
-        </nav>
+</nav>