Flight
LA has tons of airports and somehow they all get you to Pasadena in about an hour, but you'll have to weigh cost versus flight time versus difficulty when you arrive. BUR (Burbank) is easiest and closest LAX (Los Angeles) is cheapest but has traffic and lines ONT (Ontario) is easy but farther, about 60-80 minutes east SNA and LGB (Santa Ana and Long Beach) are beachy but also farther, about 60-80 minutes south
Hotel
Expedia guest review: 8.2/10, about $240 total per night.
Hotel
Several other hotels near our reception location can be found at the page linked below, or there are many Airbnbs or Vrbos nearby: https://zola.hotelplanner.com/EventPage7617884