Your app buttons display as blue all of the time, they should only be blue when the class is actually open for booking. If the class isn't available to book yet, it should be gray. Same with the 'join wait-list' function. A user should never be prompted to join a wait-list if the wait list is full, and today you have to click the button to find out. So stupid. Also, anyone who wants to be wait listed should be able to join. There should be no wait list cap.