Scheme to notify a user at a specific time?

Question

Django

Hello.
In the project, it is necessary to create notifications to users at a certain time (up to a minute).
Some calendar of events.
What is the best way to design this circuit?
A head-on solution is to use celery to run all events every minute and compare them with the current time. But, not quite the right and logical solution.
What are the options, please?
Thank you in advance.