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Best answer
9
Rajadamnern or Lumpinee (new venue) — buy tickets official website or box office, 1000–2000 baht. Tourist bars on Khao San selling "VIP" often overprice or fake fights. Real stadium schedule Tue/Thu/Fri/Sat varies — check current card. Fights start evening, arrive early. Not family with toddlers — loud, betting atmosphere. Taxi/BTS+Ratchadamnern. Shorts OK, respectful.
2
Muay Thai at Asiatique tourist show fine if you want spectacle not sport.