If you're looking for a refund or class credit, you need to back out of the class a full week before it starts. (No exceptions!) We know it's draconian, but since we aren't charging an arm and a leg and have to buy all our materials in advance, it's kinda hard to deal with last-minute bailings.
Instead of dropping out if you have a schedule conflict, a better idea is to ask around and see if any of your friends want the spot. We can't give you a refund less than a week out, even if there's a wait list for the class.