"Harold is incredibly prolific," says Brett Bloom of fellow artist Harold Jefferies. "I've been sorting through work for the show and I've gone through about a hundred pounds of drawings. He just doesn't stop." Bloom met Jefferies, who's 40 and developmentally disabled, through his work with the Little City Arts Center's studio arts program in Palatine. Jefferies has been in the program since its inception in 1994, and his work--which includes elaborate renderings and 3-D models of houses and drawings inspired by monster movies--has been featured in several group shows over the years, including exhibits at the Chicago Cultural Center and the MCA. His first solo show, "Smoking Room: The Harold Jefferies Show," opens on Saturday, October 4, at Mess Hall, a collective exhibition space in Rogers Park run by Bloom and several other artists; the drawings, installations, and a wall made of bricks, cotton, clothing, drywall, wood, and paper that Bloom says Jefferies describes as "so thick God can't see through it" will be up through October 25. From 4 to 6 there'll be a free reception for the artist at Mess Hall, 6932 N. Glenwood; call 773-465-4033. Outside the gallery Rob Kelly and Zena Sakowski will lead an interactive art project in conjunction with the free Glenwood Avenue Arts Walk and Street Fair, which runs from noon to 6 on Glenwood between Farwell and Touhy and includes live music and theater, open studios, food, and crafts. See www.rogerspark.com for more.