Elliot,
Here is the NMRA New Hampshire 2018 Tour de Chooch list. Some layouts are local, others an out of area trip 1-2 hours away. It’s open to the public but it’s mostly train nuts like me. It’s runs the days after Thanksgiving so some folks are out of town. Layouts vary from N to G and 3 rail it all depends on who signs up, it’s been running for 15+ years now. There are some very large and famous model railroader layouts and some modest ones. It’s fun as it’s view on your own and not a convention as such, just local folks driving around and enjoying. See the link below.