When we think of a hot day at the zoo, we picture lethargic animals and sweating visitors. But this Hot Day at the Zoo is very cool, and anything but lethargic. The frenetic foursome from Lowell peels off a gritty urban-bluegrass sound laced with folk, blues, ragtime, and jazz - a mix their fans call "ZooGrass." Celebrating five years, the string band is at the Lizard Lounge to play original tunes from its first full-length release, "Cool as Tuesday" (we told you they were cool), as well as tracks from a forthcoming EP and covers of Elvis, Nirvana, and the Dead. 21+ 8 p.m. $10. Lizard Lounge, 1667 Massachusetts Ave., Cambridge. 617-547-0759. hotdayatthezoo.com
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