Next Sunday: A big to-do for activity-starved, culture-feeding parents every winter, 89.3 the Current's family-friendly indoor answer to Rock the Garden is coming at especially the right time and boasts an especially strong lineup, led by 2012 Grammy winners the Okee Dokee Brothers, previewing their new mountain-hiker album. The bluegrassy duo will be joined by unicorn-believing chant-rap duo Koo Koo Kanga Roo as well as Gustafer Yellowgold, the yellow sun dweller who split for the Minnesota woods. Or so goes the story by New York-based creator/singer Morgan Taylor. Sisterly indie-folk duo the Ericksons also join the fray, which includes the usual dance-floor-shredding, drum-banging extracurricular activities that keep MIA staffers on edge all day. (11 a.m.-5 p.m. next Sun. Free. Minneapolis Institute of Arts and Children's Theatre, 2400 3rd Av. S., Mpls.