Most metro area art walks are on the first Friday of each month, but Longmont schedules most of its on Saturdays and this month has planned its FREE downtown ArtWalk Longmont for Saturday, September 16 from 4 p.m. to 8 p.m. Click here to download a block-by-block map. Wander the downtown streets for art, music, food, kids’ activities and more. The event stretches along Main St. between Third and Sixth, plus occasional jogs down a side street. One of these is the chance to visit the historic Callahan House (3rd and Terry), which is open to the public just a few times a year.