How do I temporarily stop submissions

How do I temporarily stop submissions and put a popup message informing people that the race is postponed?

You can assign a temporary expiration date on your form so that it will be disabled by schedule.

User guide: https://www.jotform.com/help/137-How-to-limit-submissions-in-a-form

Disable on date

This allows you to set your form to be disabled on your preferred specific date and time.

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Related : https://www.jotform.com/help/274-How-to-Clear-Your-Form-s-Expiration-Date