Thanks Kevin...I ventured up there this weekend and yes, April 18th every year there is a Catfish "ceremony" albeit a rather clandestine affair and kept very secret, under wraps amongst the tight-knit fishing community. Would say more about that, but i am in the process of writing an article on it...
However, what is great fun and little publicized is the weekend action of boat races the week of Songkran. Great fun, and a refreshing sight to see teams in their colours of blue, red, yellow, green, pink and purple to have fun partying away together - no politics attached! Anyone looking for an alternative to Bangkok and Chiang Mai next year should consider this event.
I can highly recommend to anyone going to Laos over the border crossing from here to stay a night or two in Chiang Khong - there is a great travel photography gallery at the Green Tree Guesthouse, the best mexican meal in Thailand by far at the Bamboo Bakery, and excellent Doi Chang coffee on the high-street coffee stall and a town full of endearing characters. The surrounding scenery is breathtaking.
As for the catfish...they can be spotted more frequently in May. The eco-systems are changing and livelihoods with it.
Cheers!
Liz