We ended up going to the event and they were able to squeeze me in. I had to sit backwards which meant every time the instructor did anything I had to move, which was a huge PITA, but otherwise it was a great night. To be honest, I don't know if it was so fun because of the people in my group or the event itself, but I will say I enjoyed myself. I can't stand to paint and don't have an artistic bone in my body but my painting actually came out really nice.
I will say that just about everyone there who had purchased a Groupon had issues with it, so I stand by my recommendation that you do NOT buy a Groupon if you want to try this out. I bet if you call the company they will give you the Groupon rate without you having to buy the actual Groupon.