DR ChasSmith - is the Marcus Dairy at the entrance to the Danbury Fair Mall no longer? I would have thought that they'd have wonderful ice cream sodas...
I hate to be the bearer of bad news, but the Marcus Dairy is no more.  They sold to a developer a couple of years ago, and the site is now "The Shops at Marcus Dairy".  Completely rebuilt, of course.  Only the historic silo remains.  Whole Foods (the city's first), a Petco, couple of other things.
You know what an incredible bikers' hangout it was, right?  They've had no such place to go on Sundays since it closed, but I just heard that they're about to reinstate the tradition, to be held in the parking lot next to the aforementioned silo.