My Russian professor one year had an after-semester dinner party at her own house, complete with some of her family and friends showing up to play traditional music and teach us about the foods they made and stuff. There was indeed dancing and instruction of such, as well. And yes, everyone clapped, because that’s a traditional way to keep beat with music, especially music meant for movement.

It was a really small class, but all the same, that sort of thing does happen, especially with language teachers in my experience, because they also want to teach culture. Those were most of my coolest (other than my very wacky physics prof).