Welcome to the Community, @jodirog -
Thank you for your first post!
Currently, there isn't a way to turn off the date/time/locations completely in the Online Store, so it would be considered a Feature Request.
There is a workaround that can give you part of what you're looking for. Go under the details of the event to where you see "Start Date" and it will show you the option to select "This event has no end date". This would allow your customers to sign up and complete the run whenever they'd like.
Please let me know if you have any other questions.
