haha welll, it really depends on the area, I usually do events like that on a volunteer basis, when events like that do offer to pay me I'm very flexible, my average hourly rate at like a gym is $25/hour so I'll tell them that but say that it's negotiable...where are you? I may have Zumba connections near you that I could figure out the going rate, or just be open with them, maybe figure out what your budget is and ask them what they typically charge, because every instructor is different too, some instructors here charge $35 or $40 an hour, but this is just a side gig for me so I tend to work for cheaper...but if what they want is way out of your budget just be honest with them and ask if maybe they could recommend someone else who would be more in your price range? Zumba instructors tend to be reallllllly approachable and super easy to just be honest and work stuff out with Good luck!