Photo by Flickr user twovanillabeans.

PLASTICS: The City Paper screens Mean Girls as part of their Summer Cinema series. The Park at CityCenter (11th and New York Avenue NW) Free.

RAINBOWS: Join a group sing-along of songs including “Barbie Girl,” “Colors of the Wind,” and “Men in Black,” in this Rainbow Connection edition of A People’s Choir. Stetson’s Famous Bar & Restaurant (1610 U Street NW) 7:45 p.m. Free.

ROCK CLIMBING: Learn the “3 P’s of Climbing Psych” from John McCauley, who has previously “lived out of his car at the New River Gorge in WV, living the dirtbag dream.” Meridian Pint (3400 11th Street NW) 7-10 p.m. Free.