She probably put it on FB because she felt awkward about it and didn't know how to break the news to you. I would try to be understanding and supportive. I'm betting that she just didn't want to disappoint you.
I would call it a "live cooking demo," and make sure that you show them a variety of foods. Do one appetizer (mini tart pan), one main dish (DCB), and one dessert (trifle bowl). Tell them that the cost of attendence is $15, but that each guest will receive full-color recipe cards to take home...