[jessedan]

First you must find out how much they charge, do they charge per person? Per hour? Per workshop? Everyone works differently.
Then you have to figure out how much you must charge the attendees for the workshops in order to cover the instructors fees, studio rental, airfare, instructors hotel expense and meals.
Sometimes intructors are willing to stay at your house rather than a hotel, so that would bring your expenses down a bit. Other times, they prefer a hotel.
It also depends on whether you want to charge an organizer's fee or not.
You've got to take all these thing into consideration when setting the cost for the workshops, so that none of this comes out of YOUR pocket and you don't end up losing money.

Regards
Priscilla