Hey Statistical Caterpillar — thanks for posting this. Just want to make sure we’re talking about the same kind of “class restriction” before we point you in the right direction: are you looking to restrict registration based on being enrolled in (or having completed) another specific class, being part of a certain program/group, or something else entirely? Also, where should that restriction kick in on the registration page — should it stop someone from registering up front, or let them start and then block them before submit/payment? And lastly, should anyone be able to override it (ex: staff/admins registering someone manually), or should it apply across the board?