add json tag to model

models/event.go

@@ -5,5 +5,5 @@ type Event struct {
 	Name      string    `gorm:"column:name" json:"name"`
 	Date      string    `gorm:"column:date" json:"date"`
 	Day       string    `gorm:"column:day" json:"day"`
-	Attendees []*Member `gorm:"many2many:member_events;"`
+	Attendees []*Member `gorm:"many2many:member_events;" json:"attendees"`
 }