Not much more to say than that, except that the celebrations were cancelled. It's possible that this was connected to the insurgency in southern Thailand, although as far as I know there isn't any confirmation and the police chief said it was doubtful. It's more likely to be connected to former Prime Minister Thaksin Shinawatra, who was ousted in a non-violent coup earlier in 2006- the NYT said that "the junta has warned of a continuing threat of instability from his backers."
Personally, I had been surprised that the whole thing seemed to be so peaceful. I suppose that in Thailand, like in so many other situations, instability is a long term proposition.