在特定日期之后删除django模型实例的最佳方法

I am writing a little app where the user creates an event and specifies the date that event will occur. After the event date has past, I want to delete that event instance. My current attempt is throwing a function that checks if the event should expire in the event page view. I am not sure whether the expiration_check function is checking in a correct way, nor am I sure whether just having a function in the view will event work. I am writing a little app where the user create