I recently visited Laos for the second time and was fortunate enough to be there for two festivals. I have placed slideshows on my personal website for those who may be interested.
Pii Mai is the Laos New Year festival which involves copious amounts of water, loud music, booze and the odd bit of cross dressing. No one is safe from a potential drenching. I was in Vientiane for this years festivities.
http://travelsinasia.com/Laos/piimaislideshow.html
Further north I visited the town of Muang Sing hoping to trek to minority villages. I had arrived unwittingly the day before the annual Rocket Festival which is designed to bring on the rainy season.
http://travelsinasia.com/Laos/rocketfestivalslideshow.html
Currently settled in Taiwan waiting for another opportunity to get away.