I looked up the dates for the Concord NH show at the Everett Arena and it's under a different name...web site:
https://gunshowtrader.com/gun-shows/concord-nh-gun-show/
A little more research shows that on June 1, 2017, New England Events acquired the DiPrete Promotions, Inc. Gun Shows.
https://gunshowtrader.com/gun-shows/concord-nh-gun-show/
A little more research shows that on June 1, 2017, New England Events acquired the DiPrete Promotions, Inc. Gun Shows.