Just found out about this. Might be cool to go down and watch for a while. It's a Race from Maine to FL. The first night stay is in Lowell. There are a bunch of cool bars down there and looks like they will have some stuff going on as well.
http://www.greatrace.com/2014-cities
http://merrimackvalley.org/events/great-race
I might be doing something during the day with some people, but they live RIGHT there so will probably be there for the participants to arrive. Might try to talk them into staying the whole day and do the car show thing to. I don't know about 400 cars doing the show, but would be impressive to watch around Lowell.