Flight
When flying internationally into Thailand, your flights will go to this airport. If the flight shows flying into BKK, you should be good! Flights do not seem to be cheaper if purchased a long time in advance. We recommend purchasing tickets in February or after. And be sure to check travel time, they can get very long the cheaper that they are.
Hotel
The wedding venue is right next door to this hotel. It is also in the middle of Bangkok, and really close to many public transportation options (Airport Link, MRT, and BTS). There are lots of good options if you want to stay in a hotel, but this is just one suggestion!
House Or Rental
Thailand uses Airbnb too! If you choose to go this route, the best parts of Bangkok (for the wedding) are around Asoke, or Bangna (anywhere in Bangkok is good, it will just change your travel times). Airbnb is usually the more expensive route in Thailand, but it's a great option if you're looking for more of a house feel. **There are airbnbs all around Thailand! So if you're continuing your trip outside of Bangkok, there still might be options.
Rental Car
The "Uber" of Thailand, Grab is the taxi app you need for getting around Bangkok. You can order rides, food, and deliveries with this program. You can also use "Bolt" (https://bolt.eu/en/cities/bangkok/); another taxi app available.