I have not been to one -
but I would want to know:
What equipment is available (translation - what will I need to bring with me?) as far as tables, chairs, lighting, extension cords, irons, ironing boards, electrical outlets, etc.
How many people are expected/wanted?
Will there be a leader/manager/coordinator - or not?
Will it be a "planned" or "do your own thing" sort of event?
Are there quilt shops near by so in case someone needs to get something, it would be fairly handy?
What about meals and food? Bring your own? Someone will cook? Go out to eat? Kitchen facilities?
Sleeping arrangements? I prefer to at least have a bed to myself - and I am told that I snore -
Will smoking be allowed?
How much will it cost?
Is tipping expected or customary?
Will the building be handicapped accessible? (That may or may not be relevant - depending on who is attending.)