When it comes to invitations to bachelorette bashes, the main rule is that everyone who's invited must also be on the wedding guest list. Other than that, the type of party usually determines who's to be invited. For a traditional night on the town, invitees can include all friends and some family members, whether that means 10, 20, or 40 or more people. For mini-vacation parties, practical considerations tend to keep the guest list limited to close friends and siblings -- it's just too difficult to plan a trip if there are too many people involved. Plus, as the price rises, the number of partiers willing to pay usually drops. We caution honor attendants not to forget the fiance's female relatives when planning a typical night on the town (they need not be invited to more intimate gatherings, unless the bride enjoys a close relationship with them). While they may choose not to attend such an outing for the bride, an invitation should be extended to them anyway.