“Turn up on time. There isn’t an army of sous chefs to whip you up a hot dinner if you arrive late. You wouldn’t turn up to a friend’s dinner very late would you? Conversely: do not arrive early. It puts the host/hostess in a difficult position. That last five minutes before showtime that you interrupted was probably their only opportunity to put on mascara, spray deodorant under their shirt to hide cooking smells, reapply lipstick.”
More tips at Find a Supper Club – Info for Guests