People party like it's 1999, or at least 2013, at the Ratchaprasong New Year's Eve bash.
The Ratchaprasong New Year's party is the biggest New Year's party in Thailand. The area, which is also home to Bangkok's swankiest shopping centers (Louis Vitton on one corner, Kate Spade on another) and some of the most spiritual places in Thailand (Erawan Shrine and Wat Pathum Wanaram). Dropping a giant party in the middle of the intersection is a guarantee for a dynamic evening.
Thais visit temples and shrines as a normal part of their New Year's routine, so Erawan Shrine and Wat Pathum Wanaram see a steady flow of spiritual visitors. Free music and fireworks bring the teenagers and tourists come to the party because, well, it's a free party in Bangkok.