Leave decisively: don’t loiter in the hallway, coat on, prevaricating. Once you’ve decided to leave, say your goodbyes to other guests, and then thank your host or hostess before heading for the door. Try not to disrupt other guests’ enjoyment. If you are leaving mid-event, make your departure swift and discreet, ensuring that you do not precipitate the end of the party. If you are the last person left, and your hosts are visibly wilting, you have probably outstayed your welcome. Now is the time to make your exit.