I would say yhe wedding party, the parents, spouses of the wedding party, and children( if you want) and i have also heard of people inviting other close friends, but i think the rehersal dinner is so you can corigraph the next day, so only the people you really have to have their. We are going to have our wedding at my MIL"S house and so i figured we would set up the day before, have the rehersal and a BBQ then all of us girls are going to my bridal shower. But i think how ever and where ever you want it is okay. as long as you and the groom are happy