Chiang Mai Flower Festival (February)
Chiang Mai Flower Festival
Why go: Watch the floral parade of floats

Songkran Festival (April)
Songkran Festival
Why go: Thai New Year; celebrated across Thailand like the Had Yai Midnight Songkran in Songkhla, I San Maha Songkran Festival in Nong Khai, Ayutthaya Songkran Festival, and Phra Pradaeng Songkran in Phra Pradaeng

Bun Luang & Phi Ta Khon Festival (June)
Phi Ta Khon
Why go: Part of merit-making festival featuring colorful ghost masks and costumed participants

Loy Krathong (November)
Loy Krathong
Why go: Festival of lights, see floats made of intricately designed traditional banana leaf set adrift in waterways

Monkey Buffet Festival (November)
Why go: Set in the ruins of the historical city of Lopburi