diff --git a/calendar/calendar.go b/calendar/calendar.go
new file mode 100644
index 0000000..6550ea7
--- /dev/null
+++ b/calendar/calendar.go
@@ -0,0 +1,24 @@
+package calendar
+
+import "time"
+
+type Calendar struct {
+	ID uint `gorm:"primaryKey"`
+
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+type EventGroup struct {
+	ID uint `gorm:"primaryKey"`
+
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}
+
+type Event struct {
+	ID uint `gorm:"primaryKey"`
+
+	CreatedAt time.Time
+	UpdatedAt time.Time
+}