Recently a new ensemble group started across town that focuses on Baroque music. During the first rehearsal we were asked to re-tune the instruments to A=415 instead of 440 to give an authentic Baroque sound. The 1 instrument we don't see very often is a recorder along with violins, violas, cellos, transverse flute. The 1 instrument we don't have is a harpsichord.
When it comes to music performance, I attneded a church fundraising event yesterday with an hour of Gospel music. A lot of singing on top of various instruments including keyboard, guitar & drums. The congregation joined in the singing. Different phrases in a song were repeated many times in an improvised manner. Each time the singing would get louder and more exciting. When singing traditional church hymns you'd do the verses of a song in order just once.
Next is an upcoming piano solo performance in my area for students who wanted a chance to perform in public. It's a small group up to 20 people at most. Anybody from an absolute beginner can participate. The program is not decided ahead of time. During the performance, students would take turn going to the piano and announce the piece(s) he/she is about the play. The last time I went to a gathering, some people played pieces above their level. Instead of playing a piece through they'd hesitate in certain places and restart certain sections. A gathering like this is not for showing off your technical abilities or how good you can perform. It's a chance for people to play in front of an audience to get rid of performance anxiety (stage fright).