There is a Feast of San Donato on August 7th. The church is on Market Street in Watertown (I think the address is 450 or 400 Market Street, Watertown. The mass is at 4:30pm. After the mass, the festival continues.
I am still trying to find out where the rest of the festival will be after the mass, so as soon as I know, I will post another message within the week. I hope some of you go to the festival. The Feast of San Donato in Italy is held during the same time as the one in Watertown