I bet there aren’t many large, indoor venues in NH. At least not large enough for Trump rallies.
I only found one in NH on this list of >10,000 cap
https://en.wikipedia.org/wiki/List_of_indoor_arenas_in_the_United_States
Trump being interviewed by Anderson Cooper in a restaurant in NH, he is so impressive. Those intimate settings will benefit him as much as the big rallies.