If you're planning a Friday or Saturday wedding in May, now is the time to reserve and confirm your transportation. Limousines typically start to book for proms after the holiday break, and you don't want to find that everything has been spoken for on your special day. If limousines aren't your style, or if none are available on your date, consider a vintage automobile, traditional Town Car sedan or even a luxury SUV, all of which are less apt to be booked by prom-goers. Party buses and trolleys are also great options for larger groups.