Django: How to automatically change a field's value at the time mentioned in the same object?

Question

I am working on a django project for racing event in which a table in the database has three fields.

1)Boolean field to know whether race is active or not

2)

Answer 1

Is there any reason you wouldn't just calculate the boolean field in your business logic? i.e. when you receive a request related to that race, simply check the times and assess whether or not the race is active (for display, analysis), etc.

I'm assuming you won't have high load (one reason for pre-processing) like this.