diff --git a/bda/admin.py b/bda/admin.py
index 2aec82c9..55b0475f 100644
--- a/bda/admin.py
+++ b/bda/admin.py
@@ -94,9 +94,12 @@ class WithoutListingAttributionInline(AttributionInline):
 class ParticipantAdminForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.fields["choicesrevente"].queryset = Spectacle.objects.select_related(
-            "location"
-        )
+        queryset = Spectacle.objects.select_related("location")
+
+        if self.instance.pk is not None:
+            queryset = queryset.filter(tirage=self.instance.tirage)
+
+        self.fields["choicesrevente"].queryset = queryset
 
 
 class ParticipantPaidFilter(admin.SimpleListFilter):
@@ -202,17 +205,6 @@ class ParticipantAdmin(ReadOnlyMixin, admin.ModelAdmin):
 
 
 class AttributionAdminForm(forms.ModelForm):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
-        if "spectacle" in self.fields:
-            self.fields["spectacle"].queryset = Spectacle.objects.select_related(
-                "location"
-            )
-        if "participant" in self.fields:
-            self.fields["participant"].queryset = Participant.objects.select_related(
-                "user", "tirage"
-            )
-
     def clean(self):
         cleaned_data = super().clean()
         participant = cleaned_data.get("participant")
@@ -225,6 +217,12 @@ class AttributionAdminForm(forms.ModelForm):
                 )
         return cleaned_data
 
+    class Meta:
+        widgets = {
+            "participant": ModelSelect2(url="bda-participant-autocomplete"),
+            "spectacle": ModelSelect2(url="bda-spectacle-autocomplete"),
+        }
+
 
 class AttributionAdmin(ReadOnlyMixin, admin.ModelAdmin):
 
@@ -284,15 +282,14 @@ class SalleAdmin(admin.ModelAdmin):
 class SpectacleReventeAdminForm(forms.ModelForm):
     def __init__(self, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.fields["confirmed_entry"].queryset = Participant.objects.select_related(
-            "user", "tirage"
-        )
-        self.fields["seller"].queryset = Participant.objects.select_related(
-            "user", "tirage"
-        )
-        self.fields["soldTo"].queryset = Participant.objects.select_related(
-            "user", "tirage"
-        )
+        qset = Participant.objects.select_related("user", "tirage")
+
+        if self.instance.pk is not None:
+            qset = qset.filter(tirage=self.instance.seller.tirage)
+
+        self.fields["confirmed_entry"].queryset = qset
+        self.fields["seller"].queryset = qset
+        self.fields["soldTo"].queryset = qset
 
 
 class SpectacleReventeAdmin(admin.ModelAdmin):
diff --git a/bda/migrations/0018_auto_20201021_1818.py b/bda/migrations/0018_auto_20201021_1818.py
new file mode 100644
index 00000000..88a56c39
--- /dev/null
+++ b/bda/migrations/0018_auto_20201021_1818.py
@@ -0,0 +1,38 @@
+# Generated by Django 2.2.12 on 2020-10-21 16:18
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("bda", "0017_participant_accepte_charte"),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name="participant",
+            options={"ordering": ("-tirage", "user__last_name", "user__first_name")},
+        ),
+        migrations.AddField(
+            model_name="tirage",
+            name="archived",
+            field=models.BooleanField(default=False, verbose_name="Archivé"),
+        ),
+        migrations.AlterField(
+            model_name="participant",
+            name="tirage",
+            field=models.ForeignKey(
+                limit_choices_to={"archived": False},
+                on_delete=django.db.models.deletion.CASCADE,
+                to="bda.Tirage",
+            ),
+        ),
+        migrations.AddConstraint(
+            model_name="participant",
+            constraint=models.UniqueConstraint(
+                fields=("tirage", "user"), name="unique_tirage"
+            ),
+        ),
+    ]
diff --git a/bda/models.py b/bda/models.py
index 80790746..578f235c 100644
--- a/bda/models.py
+++ b/bda/models.py
@@ -31,6 +31,7 @@ class Tirage(models.Model):
         "Tirage à afficher dans le catalogue", default=False
     )
     enable_do_tirage = models.BooleanField("Le tirage peut être lancé", default=False)
+    archived = models.BooleanField("Archivé", default=False)
 
     def __str__(self):
         return "%s - %s" % (
@@ -197,7 +198,9 @@ class Participant(models.Model):
     attributions = models.ManyToManyField(
         Spectacle, through="Attribution", related_name="attributed_to"
     )
-    tirage = models.ForeignKey(Tirage, on_delete=models.CASCADE)
+    tirage = models.ForeignKey(
+        Tirage, on_delete=models.CASCADE, limit_choices_to={"archived": False}
+    )
     accepte_charte = models.BooleanField("A accepté la charte BdA", default=False)
     choicesrevente = models.ManyToManyField(
         Spectacle, related_name="subscribed", blank=True
@@ -208,6 +211,12 @@ class Participant(models.Model):
     def __str__(self):
         return "%s - %s" % (self.user, self.tirage.title)
 
+    class Meta:
+        ordering = ("-tirage", "user__last_name", "user__first_name")
+        constraints = [
+            models.UniqueConstraint(fields=("tirage", "user"), name="unique_tirage"),
+        ]
+
 
 DOUBLE_CHOICES = (
     ("1", "1 place"),