If a class is full you will see the “Join Waiting List” option. Click on this to add the class to your shopping cart and check out. You won’t be charged anything and you will now be on the waiting list. If a seat becomes available, you will be notified via email and have the option to register at that time. Being on a waiting list doesn’t automatically register you for a class, it just emails you if and when a seat opens up. Everyone on the waiting list gets the same notification at the same time, and has the same opportunity to register for the class. So you need to act fast to secure the open seat.