Lest we allow YouTube to have us believe that every teenager who picks up a video camera only wants to film themselves dancing to Lady Gaga’s “Just Dance,” the Lark Theater Youth Film Festival showcases 20 short films by Marin teenagers that capture the depth, thought, insight and spirit of youth. This year’s third annual festival adds a “green” category to the documentary, music and narrative lineup; each entry is under 12 minutes long, but if prior years are any indication, the talent and entertainment at the festival is high. Spread across two age categories, 10-13 and 14-18, the competition rewards the best entries in front of a perennially sold-out crowd. Advance tickets are recommended when the festival returns on Monday, April 27, at the Lark Theater, 549 Magnolia Ave., Larkspur. 12:30pm. $10. 415.924.5111.