During months where the weather is decent, the MIT ham radio club holds a swap meet in one of the campus parking lots, on the third Sunday of the month. Though there are radios in abundance (as well as test equipment, antiques, vacuum tubes and parts, antique test equipment ...), the focus these days seems more on computers and parts. Plus the occasional bit of just plain cultural flotsam. (This month's prize: a mint condition "Trump: The Game", with the Donald's face peering out quizzically from behind the original shrinkwrap).
Some of the vendors' trucks also raise an eyebrow. One in particular was completely covered with bumper stickers, leaning by and large toward the left. There was a bumper sticker that read: "The most violent element in society is ignorance". More prominently placed on the same truck was another bumper sticker, that read: "My kid beat up your honor student."