diff --git a/occurrences/models.py b/occurrences/models.py
index 1f2b451e..ba71c331 100644
--- a/occurrences/models.py
+++ b/occurrences/models.py
@@ -291,11 +291,12 @@ def has_enrolments_system(self) -> bool:
 
     def has_space_for_enrolments(self) -> Optional[bool]:
         """
-        Determines whether any (upcoming) occurrence has any space left
+        Determines whether any upcoming or ongoing occurrence has any space left
         for enrolments.
 
         Returns:
-            - True: If at least one upcoming occurrence has space for enrolments.
+            - True: If at least one upcoming or ongoing occurrence has space for
+                enrolments.
             - False: If no upcoming occurrences have space for enrolments.
             - None: If the event doesn't utilize the enrolments system or
                 relies on an external enrolments system.
@@ -303,11 +304,20 @@ def has_space_for_enrolments(self) -> Optional[bool]:
         if not self.has_enrolments_system() or self.has_external_enrolments_system():
             return None
 
-        return any(
+        has_upcoming_space = any(
             occurrence.has_space_left()
             for occurrence in self.occurrences.filter_upcoming()
         )
 
+        if self.enrolment_end_days is None:
+            # No limit to when enrolments can be made before the occurrence start.
+            return has_upcoming_space or any(
+                occurrence.has_space_left()
+                for occurrence in self.occurrences.filter_ongoing()
+            )
+
+        return has_upcoming_space
+
 
 class OccurrenceQueryset(models.QuerySet):
     def delete(self, *args, **kwargs):
@@ -315,11 +325,14 @@ def delete(self, *args, **kwargs):
             obj.delete()
 
     def filter_upcoming(self, *args, **kwargs):
-        """Filter occurrences that are not not cancelled and
-        are held in the future.
-        """
+        """Filter occurrences that are not cancelled and are held in the future."""
         return self.filter(cancelled=False, start_time__gte=timezone.now())
 
+    def filter_ongoing(self, *args, **kwargs):
+        """Filter occurrences that are not cancelled and are ongoing at the moment."""
+        now = timezone.now()
+        return self.filter(cancelled=False, start_time__lte=now, end_time__gte=now)
+
 
 class Occurrence(GDPRModel, SerializableMixin, TimestampedModel):
     OCCURRENCE_SEAT_TYPE_CHILDREN_COUNT = "children_count"
diff --git a/occurrences/schema.py b/occurrences/schema.py
index 92555044..e08e0e19 100644
--- a/occurrences/schema.py
+++ b/occurrences/schema.py
@@ -219,7 +219,8 @@ def resolve_last_occurrence_datetime(self, info, **kwargs):
 
     def resolve_has_space_for_enrolments(self, info, **kwargs):
         """
-        Determines whether any upcoming occurrence has any space left for enrolments.
+        Determines whether any upcoming or ongoing occurrence has any space left for
+        enrolments.
 
         This method leverages the internal `has_space_for_enrolments` logic to ascertain
         if there are any future event occurrences with available spaces for enrollment.
@@ -231,7 +232,8 @@ def resolve_has_space_for_enrolments(self, info, **kwargs):
                 (may not be used in this specific implementation).
 
         Returns:
-            - True: If at least one upcoming occurrence has space for enrolments.
+            - True: If at least one upcoming or ongoing occurrence has space for
+                enrolments.
             - False: If no upcoming occurrences have space for enrolments.
             - None: If the event doesn't utilize the enrolments system or
                 relies on an external enrolments system.
diff --git a/occurrences/tests/test_models.py b/occurrences/tests/test_models.py
index a1bda387..231856e9 100644
--- a/occurrences/tests/test_models.py
+++ b/occurrences/tests/test_models.py
@@ -980,20 +980,90 @@ def test_palvelutarjotin_event_has_space_for_enrolments_returning_boolean(
     mock_get_event_data,
 ):
     p_event = PalvelutarjotinEventFactory()
+    # Past occurrences
+    OccurrenceFactory.create_batch(
+        4,
+        p_event=p_event,
+        cancelled=False,
+        start_time=timezone.now() - timedelta(days=2),
+        end_time=timezone.now() - timedelta(days=1),
+    )
+    # Ongoing occurrences
+    OccurrenceFactory.create_batch(
+        2,
+        p_event=p_event,
+        cancelled=False,
+        start_time=timezone.now() - timedelta(days=1),
+        end_time=timezone.now() + timedelta(days=1),
+    )
+    # Future occurrences
     OccurrenceFactory.create_batch(
         3,
         p_event=p_event,
         cancelled=False,
         start_time=timezone.now() + timedelta(days=1),
+        end_time=timezone.now() + timedelta(days=2),
+    )
+    assert p_event.occurrences.count() == 9
+    assert p_event.occurrences.filter_upcoming().count() == 3
+    assert p_event.occurrences.filter_ongoing().count() == 2
+    with patch(
+        "occurrences.models.PalvelutarjotinEvent.has_external_enrolments_system",
+        return_value=False,
+    ):
+        with patch(
+            "occurrences.models.PalvelutarjotinEvent.has_internal_enrolments_system",
+            return_value=True,
+        ):
+            with patch(
+                "occurrences.models.Occurrence.has_space_left"
+            ) as mock_has_space_left:
+                mock_has_space_left.return_value = False
+                assert p_event.has_space_for_enrolments() is False
+                assert mock_has_space_left.call_count == 3
+    with patch(
+        "occurrences.models.PalvelutarjotinEvent.has_external_enrolments_system",
+        return_value=False,
+    ):
+        with patch(
+            "occurrences.models.PalvelutarjotinEvent.has_internal_enrolments_system",
+            return_value=True,
+        ):
+            with patch(
+                "occurrences.models.Occurrence.has_space_left"
+            ) as mock_has_space_left:
+                # 2nd occurrence returns True, so result is True
+                # and any-call returns after 2nd round.
+                mock_has_space_left.side_effect = [False, True, False]
+                assert p_event.has_space_for_enrolments() is True
+                assert mock_has_space_left.call_count == 2
+
+
+@pytest.mark.django_db
+def test_palvelutarjotin_event_has_space_for_enrolments_ongoing_events(
+    mock_get_event_data,
+):
+    """Ongoing events are not considered"""
+    p_event = PalvelutarjotinEventFactory(enrolment_end_days=None)
+    # Past occurrences
+    OccurrenceFactory.create_batch(
+        2,
+        p_event=p_event,
+        cancelled=False,
+        start_time=timezone.now() - timedelta(days=2),
+        end_time=timezone.now() - timedelta(days=1),
     )
+    # Ongoing occurrences
     OccurrenceFactory.create_batch(
         3,
         p_event=p_event,
         cancelled=False,
         start_time=timezone.now() - timedelta(days=1),
+        end_time=timezone.now() + timedelta(days=1),
     )
-    assert p_event.occurrences.count() == 6
-    assert p_event.occurrences.filter_upcoming().count() == 3
+    assert p_event.occurrences.count() == 5
+    assert p_event.occurrences.filter_upcoming().count() == 0
+    assert p_event.occurrences.filter_ongoing().count() == 3
     with patch(
         "occurrences.models.PalvelutarjotinEvent.has_external_enrolments_system",
         return_value=False,