A Night to Remember - Walter Lord. Not technically YA, but it's a modern classic that shows up in middle schools and on summer reading lists. It's a page-turner, and the accumulation of details really sells the you-are-there feeling.
Property Brothers' backyard paradise- Outdoor theater Is there anything better than an outdoor movie night? Make your own screen, use piping and cement or sand to hold it all in place, then call up your friends for a night to remember.
i like this except for the scavenger hunt have her win prizes for how many questions she gets correctly. Also, have the bride pick celebrity names for each member to wear on her back. Everyone has to figure out who they are by the end of the party.