I booked a high school reunion here for 15 people and everyone had a blast. We decided to go with free form because we wanted everyone to each take home a different painting, but we could've gone with instructor-led too.
With a huge selection of paint colors, brushes, and different inspirational photo albums to choose from, you could do a lot of neat tricks. However - My painting turned out to be pretty ugly, luckily I was on the lower end of the distribution and I should keep my day job - but there were some talented artists in the group inspired by Japanese anime or other unique styles! Not sure why they are accountants now, but I guess art doesn't pay the bills. That doesn't mean you can't express yourself with friends on a Saturday afternoon though
Tip! There's parking in the back!