Baltimore is Smalltimore; you can’t keep a secret in this town. So, in that tradition, I will jump right in and reveal the surprise that awaits those who gather this weekend for the 14th annual Harvest Fest in Reservoir Hill. The main event is the neighborhood’s celebration of the brilliant mural that Shawn James conceived and painted on the side of a rowhouse with the assistance of fellow artist Brian O’Rourke. It’s a real eye-catcher, mixing reality with mildly abstract imagery: Big black-eyed Susans and purple coneflowers, and hands holding a clear glass jar with three lightning bugs inside. The jar is ajar, the bugs about to flee.