It won't be just any night

There are lots of Sharks and Jets in the Arlington Children's Theater production of "West Side Story," and if you want to see them all, you'll have to attend more than one performance. The show has two casts consisting of almost 100 young dancers, singers, and actors from 21 local communities (including Joshua Watts and Anika Benkov, left). Classics from the Bernstein/Sondheim musical include "America," "Maria," and "Cool." Ages 10 and older. Tonight at 7 (through Aug. 9). $15. Regent Theatre , 7 Medford St., Arlington. 781-646-4849. www.regenttheatre.com