If you will be flying in for the wedding you have three solid options:
Palm Springs is about 2 to 2.5 hours (without traffic) from LA and there are a bunch of things to do on the way out. See more in the "Things To Do" tab. It's mandatory to get In-N-Out if you're driving.
There is no shortage of places to stay in Palm Springs, whether you're looking for a hotel vibe or renting out a whole house. Important to note that noise restrictions for Airbnbs are extremely strict and enforced in Palm Springs, so if you're looking to party, hotel is the way to go. Some hotel recs: