Copyright law defines a public performance as one which occurs outside of a family and it's normal social circle. So any performance at an invite-only party is

Copyright law defines a public performance as one which occurs outside of a family and it's normal social circle. So any performance at an invite-only party is regarded as a public performance. For this reason, although a jail is not a public place, any performance there would be considered a public performance. This makes sense when you think about it: an invite-only party could be held in a fancy hotel and have many hundreds of guests, or it may be a business event.