The bachelor party planning traditionally falls on the best man, but it can also be handled by the groom’s brother or another good friend. All of the guys in the wedding party get an invite, but you can also include other close friends and family; just ask the groom to put together a guest list. Technically, etiquette even allows inviting guys who aren’t in the wedding party, but since herding a big bunch of bachelors can lead to headaches, don’t let the guest list get too long unless the groom specifically requests it. You can even invite the bachelor’s dad and future father-in-law to the dinner portion of the evening — just be sure to see them off after dessert, before the real late-night debauchery begins.