Now in its fifth year, the CycleShowcaseSTL returns to celebrate the art of the motorcyle. More than 50 hand-built bikes will be displayed from 11 a.m. to 5 p.m. Saturday and Sunday (September 8 and 9) at 3300 Washington Avenue (www.cycleshowcase.stl.com). The cycles are chosen both for their aesthetic appeal and historical significance, and have been loaned by museums and private collectors. In addition to the vehicles themselves, motorcycle-themed artworks will be displayed in a gallery-like atmosphere. Admission is $10 (free for kids 12 and younger), and if you're feeling fired up to ride after seeing all the bikes, a charity ride for the Aidan Jack Seeger Foundation takes place Sunday morning. Registration for that begins at 9:30 a.m. on the day of the ride.