While you can register for classes the day of the convention,
we recommend registering in advance if possible.
Simply because the classrooms have a certain amount of seats.
And we have had instances of selling out a whole room.
So if you can, register now so you miss out on your favorite class ! :-)
If you must absolutely have to wait for the day of the convention,
I recommend purchasing your classes the minute you sign in.
That way, your name is on the list. (waiting to the last minute is never a good idea.)