The three airports we recommend (as closest and most convenient to the wedding venue) are San Diego International (SAN), Ontario International (ONT) and John Wayne Airport (SNA). Los Angeles (LAX) is an additional option, however traffic there/nearby/to the wedding venue is pretty insane and, if you can avoid it, we recommend it!
The official hotel WILL be the Pala Casino Spa Resort, although we are still in the process of securing an official block of rooms/discounted rate (as Pala continues its re-opening following the COVID-19 pandemic).
We've included a number of different suggestions of what to do in and around the Temecula Valley (and beyond!) in the "Things to Do" section of this website.
Depending on your native climate, the typical "winter" weather in Southern California can be on the chilly but still sunny side (i.e. around 60 degrees in the daytime). As the Temecula Valley and surrounding areas are inland from the ocean, temperatures are more desert-like (i.e. hot afternoons, cold evenings) than they are near the coast, and we definitely have less inclement weather and more sunshine! That said, do plan on packing jackets/sweaters/pants, and we highly recommend "dressing in layers" during the day.