After two years away, a change in promoters, a reacquiring of town permits and a rebuilding of its AMA relationship, the sand of Southwick, MA will see a national level motocross event in '16. Last held in '13 with the 450 class won by Ryan Dungey and the 250 class won by Broc Tickle, the Southwick event is likely the largest pure offroad event in New England and its not likely that anything is even a close second.
Scheduled for Saturday 7/9/16 tickets are already on sale and available here: https://www.eventbrite.com/e/red-bull-southwick-national-motocross-2016-tickets-19320759913
I can tell you from having attended the event before, if you are going to attend, be prepared for a hot day and TONS of people with little room if you are holding a "general admission" ticket. This was about as or more crowded an event as any concert I've been to with long lines for bathrooms and food/drink. The action is great and you can be right on top of the track, the grounds are beautiful with the greenest of grass and pine trees and the most wonderfully tan sand/dirt track manicured as if it were Augusta National...but its not an event for those looking for cushy conditions on the cheap...If you have the ability to buy a VIP ticket that includes an all day pit pass, private bathroom and viewing areas, they are highly recommended.
Regardless, it will be great to has such a prestigeous and nationally known offroad event return to New England. Website here: http://thewick338.com