A: Rude? No way. In fact, he would probably appreciate a little reminder, since it's likely that he just forgot. Simply drop a casual hint, like "John is really looking forward to the bachelor party; let me know what night it is so I don't make other plans for us." Then wait a couple of weeks. If he still doesn't take action, you'll have to be more direct and ask him to set up a day of golfing or an evening of lounging at a cigar bar.