The best place for finding out about events in the Atheist/Humanist community in Connecticut is the Connecticut Coalition of Reason's calendar.

One event of special note is the annual Connecicut American Summer Solstice Party, held every year since 2004 at my place in Vernon on the Saturday closest to the summer solstice. Every Atheist in the world is invited. Contact me if for directions.

Also, if you can afford it, I highly recommend attending the annual American Atheist National Convention. Click on the link for more information.