Every year, the art gets more rad and the lines outside get longer at the classic gift-season tradition that is Giant Robot/GR2 Gallery’s Post-It Show. Over 400 diverse artists create mini masterpieces on these office pads, ranging in styles and mediums but working miracles in a few square inches. Curated by Giant Robot’s Eric Nakamura with artists Esther Pearl Watson and Mark Todd, the roster includes superstars and newcomers, but every piece is still just $25. Its eminently Instagrammable 15th edition opens Saturday, December 7, with a preview at 11:30 a.m. and sales starting at 2 p.m. — and the queue starting around breakfast time, because you can only buy in-person.

GR2, 2062 Sawtelle Blvd., Sawtelle; Sat., Dec. 7 & 14, 11:30 a.m.-1:30 p.m.; free. giantrobot.com.