I believe there's an active one on Old Farms Road in Avon, they found some paleoindian stuff when they were redoing the bridge and intersection with Rt10 recently. I don't know if there's an archeology season though! The grounds getting colder and harder.

I'm not sure how you'd get involved but maybe the state archeologist or Office of State Archeology is a good starting point?

https://osa.uconn.edu/