Seattle photographer and installation artist Todd Jannausch is known for his indie public art collections, including last summer’s Gallery 206, a phone booth packed with local art. He’s at it again with Small Voids, for which he’s created 100 small plexiglass “mini galleries” that will showcase work by local artists and hang (via heavy-duty magnets) from a city block’s worth of light poles and street signs for one night only, before moving on to other cities. Free. Location secret until just before event. Get updates at facebook.com/smallvoids.