Celebrate Songkran at the ACM on April 13th. I haven't seen anything on the website that indicates any sort of mass soak-n-splash, only storytelling, dress-ups and lotus-making type craft activities. Need to find out more.

Incidentally as the summer temps climb across Asia, Thailand is not the only country that tries a mass cool-off. Myanmar has Thingyan, India has Holi, and Cambodia, Vietnam and Laos have their own versions.

In these days of resource conservation, Singapore has International Water Week.