Mainstreet Day, the annual arts and craft festival sponsored by JCI Hopkins, will be held Saturday, May 17, on Mainstreet in downtown Hopkins. The event is open to the public from 9 a.m. to 4 p.m. and will feature more than 250 participating arts and craft vendors offer a variety of homemade items, including jewelry, woodworking, photography and fine art, clothing, toys, garden decor and more. JCI Hopkins reinvests all proceeds from Mainstreet Day back into the Hopkins community to support programs and projects such as Bowling with the Bunny, Little Free Libraries and the Cops 'N Kids Shopping Program.