Tonight from 6 to 9 PM the Lillstreet Art Center (4401 N. Ravenswood) hosts an open house for its 33rd annual Holiday Show, which began on November 28. Every weekend in December will feature free refreshments, hands-on art demos, and a “Drop & Shop” arts and crafts area to occupy kids ages four and up while parents browse. Tonight there will be finger foods and desserts from First Slice, Lillstreet’s in-house cafe, while artists give demonstrations in the clay and metal departments. Singer-songwriter Jessica Robbins and her band will perform.