Getting to be pretty thin lately for NH shows. You might see something in North Conway area over the summer but that would likely be somewhat informal.
There is something coming up weekend of May 7 in Fairfield Maine (up by Waterville) at Amp Lab and we usually get 2 or 3 good shows at Sanford Sound. Sanford is right over the border anyway and the mid summer show is about the biggest in the northeast.
Depending where you are the stuff in upstate NY or Canada may be do-able for you.
www.nadbl.org