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1.
Breaking and entering late night into someone's garage, and taking what one wants while the owners are asleep.

Seen in the Tilly and the Wall song "Nights of the Living Dead":
"We've got a bottle of wine, a fresh pack of smokes.
We're going to end up screaming about some midnight garage sale."
by Dresdenburning November 22, 2006
 
2.
Unwanted but still usable items and objects left at the curb or in the alley for other people to take.
Sheila was lucky to find a small bookshelf for her new apartment at the midnight garage sale.

We don't need that old pot anymore. Put it in the midnight garage sale.
by MamaBear63 July 21, 2010