diff --git a/events/event.go b/events/event.go
index 6abb27b..504307c 100644
--- a/events/event.go
+++ b/events/event.go
@@ -17,4 +17,5 @@ type Event struct {
 	Categories            []Category             `json:"categories,omitempty"`
 	ObjectCategories      map[string]CategoryKey `json:"objectCategories,omitempty"`
 	Channels              []Channel              `json:"channels,omitempty"`
+	IsInThePast           bool                   `json:"isInThePast"`
 }
diff --git a/events/events.go b/events/events.go
index b62fc97..8faed4c 100644
--- a/events/events.go
+++ b/events/events.go
@@ -26,7 +26,8 @@ type CreateEventParams struct {
 }
 
 type UpdateEventParams struct {
-	ChartKey *string `json:"chartKey,omitempty"`
+	ChartKey    *string `json:"chartKey,omitempty"`
+	IsInThePast *bool   `json:"isInThePast,omitempty"`
 	*EventParams
 }
 
diff --git a/events_test/update_event_test.go b/events_test/update_event_test.go
index 3aed56c..5e2e061 100644
--- a/events_test/update_event_test.go
+++ b/events_test/update_event_test.go
@@ -3,6 +3,8 @@ package events_test
 import (
 	"github.com/seatsio/seatsio-go"
 	"github.com/seatsio/seatsio-go/events"
+	"github.com/seatsio/seatsio-go/seasons"
+	"github.com/seatsio/seatsio-go/shared"
 	"github.com/seatsio/seatsio-go/test_util"
 	"github.com/stretchr/testify/require"
 	"testing"
@@ -196,3 +198,18 @@ func TestUpdateEventRemoveCategories(t *testing.T) {
 	require.NoError(t, err)
 	require.NotContains(t, updatedEvent.Categories, category)
 }
+
+func TestUpdateEventIsInThePast(t *testing.T) {
+	t.Parallel()
+	company := test_util.CreateTestCompany(t)
+	chartKey := test_util.CreateTestChart(t, company.Admin.SecretKey)
+	client := seatsio.NewSeatsioClient(test_util.BaseUrl, company.Admin.SecretKey)
+	_, err := client.Seasons.CreateSeasonWithOptions(chartKey, &seasons.CreateSeasonParams{EventKeys: []string{"event1"}})
+	require.NoError(t, err)
+
+	err = client.Events.Update("event1", &events.UpdateEventParams{IsInThePast: shared.OptionalBool(true)})
+	require.NoError(t, err)
+	updatedEvent, err := client.Events.Retrieve("event1")
+	require.NoError(t, err)
+	require.True(t, updatedEvent.IsInThePast)
+}
diff --git a/shared/optional.go b/shared/optional.go
new file mode 100644
index 0000000..3d95123
--- /dev/null
+++ b/shared/optional.go
@@ -0,0 +1,5 @@
+package shared
+
+func OptionalBool(value bool) *bool {
+	return &value
+}