ART What: RiNo staple Ironton Studios brings together the works of landscape painter Sharon Feder and sculptor John Ferguson for a show entitled "Passages." Why: Both artists have a very human way of playing with abstract forms and ideas. Feder's paintings use layered colors to capture nature and architecture. And, Ferguson combines steel, concrete, glass, and rock into sculptures that focus on the relationship of man and nature. Bonus: When you are in Ironton's off-the-beaten-path neighborhood, take a quick detour to the Plinth Gallery (www.plinthgallery.com) to check out an unusual series of bold ceramic vessels. Details: Through May 17. Mon-Fri, 10 a.m.-4 p.m.; Sat noon-4 p.m. Ironton Studios, 3636 Chestnut Pl. For more information, call 303-297-8626 or visit www.irontonstudios.com. MUSIC What: African guitarist and poet-activist Vusi Mashlasela joins Appalachian bluegrass group Abigail Washburn & The Sparrow Quartet for a live E-town radio show tapping. Why: Mashlasela's sweet, poignant music and activist spirit led him to play at Nelson Mandel's inauguration and sing with artists like Angelique Kidjo and Ladysmith Black Mambazo. Bonus: Nationally acclaimed banjo player Béla Fleck will join The Sparrow Quartet. Details: Thu, 7 p.m. Boulder Theater, 2032 14th St., Boulder. $20. For more information, call 303-786-7030 or visit www.bouldertheater.com. WORKSHOP What: Every Friday for the last 10 years, local business consultant John Wren has infused the city with entrepreneurial spirit by hosting Idea Cafe, a conversation group for anyone starting a new career, business, or campaign. This week, Wren has a particularly diverse group of participants lined up. Why: Meet Republican House Representative Don Marostica (Loveland), Alzheimer's specialist Dr. Bill Bergman, Denver Business Journal's Kelly Stangel, and web marketing expert Barbara Bailey. Bonus: If you enjoy this week's event, pencil it in for every Friday from now on. Details: Fri, 2 p.m. Panera Bread, 1330 Grant St. Free. For more information, visit www.johnwren.com. SHOP What: This weekend, skip the garage sales for a much grander second-hand sale: Colorado Ballet is selling its old pianos. Why: In addition to finding pianos of all major brands, expect to see new grand pianos, digitals, and verticals. Bonus: Part of the proceeds from each piano sale go directly to Colorado Ballet and its Academy to help cover their piano costs. Details: Fri-Sat, 9 a.m.-5 p.m.; Sun noon-5 p.m. Onofrio Piano Company, 1332 S. Broadway. For more information, call 303-777-2636 or visit www.onofriopiano.com.