Hello fellow Northeastern Alum! I will second what the other posters have said. I will add the baseball stadium which can be a good time on a Friday night with the right group of people. There is a game store on Amherst that has a huge selection of board games if that is your thing. Weird one I know, but the library is surprisingly good for a library not in a big city. At least before covid there were a bunch of neat community events throughout the year, these seem to be slowly returning.

The other cool thing about Nashua is it is centrally located, at least in my group it isn't uncommon for people to go down to the Boston area for drinks on Friday night and then go up to the mountains for snowboarding or hiking on Sat.