Arlo Guthrie’s 1967 song “Alice’s Restaurant” is a staple of Americana, one that has been synonymous with Thanksgiving ever since a radio station played the nearly 20-minute antiwar tune on the holiday. Deep within the Berkshires, however, Alice’s Restaurant is not just a simple folk tune, but also refers to its inspiration: a popular cafe that actually went by a different name. In reality, the place was never called Alice’s Restaurant. It was called The Back Room, but it was indeed Alice’s restaurant in one way: Alice Brock was a restauranteur, artist, and…