That's so great that you guys will be able to attend this movement's biggest social event of the year, PorcFest! I think it will be a trip of a lifetime for you guys!
If possible, I would do my touring before or after PF because you don't want to be away from the site during the fest as there are too many people to meet at this unique once a year chance, a number of whom you may likely never meet otherwise, as the people who have moved to NH, have moved all over the state, each following their own compass.
NH is not that big if you have a car a little time to drive. You'll definately have time to visit every major area (Concord, Manchester, Portsmouth/Seacoast, Keene, and even Grafton and beyond). Youl'll also be on the doorstep of the beautiful Lakes Region (just south PF) that has a whole world that comes alive on the water, during the summer months.
Look forward to meeting you and I"ll see you at PF!