Welcome to the forums. Keene, New Hampshire is definitely the place to go if you plan on being an activist or organizer. It has a libertarian community but without the urbanization of a city. Grafton County and the North Country is more for the off-the-grid type - and it’s beautiful.
Yeah the summer has the world-famous Porcupine Freedom Festival (Porcfest), February has Liberty Forum, and local areas have their own conventions and festivals. Keene is famous for the Pumpkin Festival and local libertarians used to do Keenevention.
Let us know when you plan to visit.