Okay, I didn't see this posted anywhere, so I thought I'd put something up about it. Apologies if it's already posted!
There's information here:
http://www.newenglandtransunited.org (http://www.newenglandtransunited.org)
There was a similar march/rally last year that had about 1,000 people at it! Northampton is a great LGBT-friendly city with amazing people. I'm going to try really hard to go. It's even on my birthday!