Ah that's cool! I did a couple of art markets before but never sold that much. I'm glad you had a successful market and fun with friends.
Re: jamming on bass, my BIL once got me to do that with him, and I was like, I've never played bass before! but he insisted. So I just choose the riff from Polly by Nirvana as the bass line and he was like YEAH and started jamming out. I felt all musician-like. 😄