You will need the Affirmation to Marry from your Embassy, this must be translated at the MFA in Bangkok, this must be done to get married, it will take 3 days at the most.
There are many good hotels to get married in around Bangkok, but sure the guys who live in Isaan will provide better details.
There is the Buddhist ceremony in the morning, where you get blessed by the monks, then in the afternoon or evening a party for the family. The main thing is the Registry Office or Amphur where you will actually get married, and receive the wedding certificates. Not everything has to be done at the same time, I did the Amphur in 2009 and the Buddhist ceremony in March this year.
Marriage To Thai G/F In Thailand
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what is the MFA?