Even if 4 new spots open at once, the system is set up such that only one person gets the notification at a time (those 4 spots are held for one person at a time allowing them to potentially book multiple spots).
You can cancel the waitlist so that all of your new spots are available to everybody on the waitlist on a first come first served basis! Read about how to cancel the waitlist here.
Questions? Send them our way: support@opensports.net