Flight
Southern California has many airports to choose from but the closet option would be the San Diego International Airport with about an hour drive north to the venue in Fallbrook. Another option would be SNA–John Wayne Airport which would be about an hour twenty drive south. John Wayne is typically a little more expensive to fly into since it is a smaller airport but if you're wanting to explore Orange County while you're in town it's a really good option.
House Or Rental
Air Bnb has lots of great options in the area to stay. Cities to stay would be Fallbrook, Temecula, and Oceanside. Definitely recommended over a hotel!
Hotel
Pechanga is THE hotel in this area if you're looking for more resort like accommodations. This would be a whole vacation in itself! Only a 16 minute drive to the venue.
Hotel
This is another great option close to Old Town Temecula! Only a 12 minute drive from here to the venue!