Perhaps because I have begun reading Happy at Last: The Thinking Person's Guide to Finding Joy (a recent blog post mentioning the book), the notion of a "happiness movement" strikes me as saccharine and jejune. Nevertheless, there is such a movement and you can join in on October 9 and 10.
From the Web page of the Global Happiness Summit:
The First Annual Global Happiness Summit will take place October 9th –10th of 2010 aboard the USS-Hornet, an American treasure that participated in the Apollo 11 space mission.
The Global Happiness Summit will be the most important and dynamic summit in the history of the happiness movement, bringing together hundreds of industry, government and visionary leaders, research scientists and accomplished students from all over the world. ...