Friends have sent a fairly casual invitation: "We're having a pot luck on NYE. Welcome to join!"
I would quite like to go, but would not want to stay until midnight. Is it rude to go and leave at about 10? Is it rude to say that's my intention?
Edit to add: the invitation is to myself and my husband, and we're both quite keen to go but leave early. If that's rude, we'll make a believable excuse and not go.