diff --git a/src/agenda_culturel/calendar.py b/src/agenda_culturel/calendar.py
index c3dfe80..a62e9ac 100644
--- a/src/agenda_culturel/calendar.py
+++ b/src/agenda_culturel/calendar.py
@@ -238,6 +238,7 @@ class CalendarList:
                     | Q(recurrence_dtend__lt=startdatetime)
                 )
             )
+            | (Q(start_day__lte=self.c_firstdate) & (Q(end_day__isnull=True) | Q(end_day__gte=self.c_firstdate)))
         ).filter(
             Q(other_versions__isnull=True) |
             Q(other_versions__representative=F('pk')) |
diff --git a/src/agenda_culturel/migrations/0116_event_agenda_cult_start_d_68ab5f_idx.py b/src/agenda_culturel/migrations/0116_event_agenda_cult_start_d_68ab5f_idx.py
new file mode 100644
index 0000000..59ec17b
--- /dev/null
+++ b/src/agenda_culturel/migrations/0116_event_agenda_cult_start_d_68ab5f_idx.py
@@ -0,0 +1,17 @@
+# Generated by Django 4.2.9 on 2024-11-23 09:58
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('agenda_culturel', '0115_alter_organisation_options_alter_event_organisers'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='event',
+            index=models.Index(fields=['start_day', 'start_time'], name='agenda_cult_start_d_68ab5f_idx'),
+        ),
+    ]
diff --git a/src/agenda_culturel/migrations/0117_event_start_time_title.py b/src/agenda_culturel/migrations/0117_event_start_time_title.py
new file mode 100644
index 0000000..c8c7ffd
--- /dev/null
+++ b/src/agenda_culturel/migrations/0117_event_start_time_title.py
@@ -0,0 +1,18 @@
+# Generated by Django 4.2.9 on 2024-11-23 10:11
+
+from django.db import migrations, models
+import django.db.models.functions.text
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('agenda_culturel', '0116_event_agenda_cult_start_d_68ab5f_idx'),
+    ]
+
+    operations = [
+        migrations.AddIndex(
+            model_name='event',
+            index=models.Index(models.F('start_time'), django.db.models.functions.text.Lower('title'), name='start_time title'),
+        ),
+    ]
diff --git a/src/agenda_culturel/migrations/0118_alter_tag_options_and_more.py b/src/agenda_culturel/migrations/0118_alter_tag_options_and_more.py
new file mode 100644
index 0000000..3801ba4
--- /dev/null
+++ b/src/agenda_culturel/migrations/0118_alter_tag_options_and_more.py
@@ -0,0 +1,33 @@
+# Generated by Django 4.2.9 on 2024-11-23 10:16
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('agenda_culturel', '0117_event_start_time_title'),
+    ]
+
+    operations = [
+        migrations.AlterModelOptions(
+            name='tag',
+            options={'verbose_name': 'Étiquette', 'verbose_name_plural': 'Étiquettes'},
+        ),
+        migrations.AddIndex(
+            model_name='category',
+            index=models.Index(fields=['name'], name='agenda_cult_name_28aa03_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='referencelocation',
+            index=models.Index(fields=['name'], name='agenda_cult_name_76f079_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='staticcontent',
+            index=models.Index(fields=['name'], name='agenda_cult_name_fe4995_idx'),
+        ),
+        migrations.AddIndex(
+            model_name='tag',
+            index=models.Index(fields=['name'], name='agenda_cult_name_9c9c74_idx'),
+        ),
+    ]
diff --git a/src/agenda_culturel/models.py b/src/agenda_culturel/models.py
index fb343c4..2a9516a 100644
--- a/src/agenda_culturel/models.py
+++ b/src/agenda_culturel/models.py
@@ -18,6 +18,7 @@ from django.core.files import File
 from django.utils import timezone
 from django.contrib.postgres.search import TrigramSimilarity
 from django.db.models import Q, Count, F, Subquery, OuterRef, Func
+from django.db.models.functions import Lower
 import recurrence.fields
 import recurrence
 import copy
@@ -68,6 +69,9 @@ class StaticContent(models.Model):
     class Meta:
         verbose_name = _("Static content")
         verbose_name_plural = _("Static contents")
+        indexes = [
+            models.Index(fields=['name']),
+        ]
 
     def __str__(self):
         return self.name
@@ -169,6 +173,9 @@ class Category(models.Model):
     class Meta:
         verbose_name = _("Category")
         verbose_name_plural = _("Categories")
+        indexes = [
+            models.Index(fields=['name']),
+        ]
 
 
 class Tag(models.Model):
@@ -203,6 +210,13 @@ class Tag(models.Model):
         default=False,
     )
 
+    class Meta:
+        verbose_name = _("Étiquette")
+        verbose_name_plural = _("Étiquettes")
+        indexes = [
+            models.Index(fields=['name']),
+        ]
+
 
     def get_absolute_url(self):
         return reverse("view_tag", kwargs={"t": self.name})
@@ -394,11 +408,16 @@ class ReferenceLocation(models.Model):
     class Meta:
         verbose_name = _("Reference location")
         verbose_name_plural = _("Reference locations")
+        indexes = [
+            models.Index(fields=['name']),
+        ]
 
     def __str__(self):
         return self.name
 
 
+
+
 class Place(models.Model):
     name = models.CharField(verbose_name=_("Name"), help_text=_("Name of the place"))
     address = models.CharField(
@@ -735,6 +754,10 @@ class Event(models.Model):
         verbose_name = _("Event")
         verbose_name_plural = _("Events")
         permissions = [("set_duplicated_event", "Can set an event as duplicated")]
+        indexes = [
+            models.Index(fields=["start_day", "start_time"]),
+            models.Index("start_time", Lower("title"), name="start_time title")
+        ]
 
     def sorted_tags(self):
         if self.tags is None: