From the Watertown Patch:
“Swapfest is a huge electronics, tools, technology, amateur radio, and gadget flea market held on the third Sunday of every month from April to October in the Albany St. parking garage at MIT. Come buy, sell, or just look at objects as diverse as WWII Enigma machines, motors, power tools, computers, space capsules, and more. Early bird buyer admission starts at 7:00 AM for $15. Normal buyer admission starts at 9 AM for $6 (or $5 with a paper printout of our flyer). Vendors can preregister by the 5th of the month by mailing in our flyer with a check or show up to register day-of for a slightly higher fee. 9 AM-2 PM, but come early for best deals. Bring cash!”