RESERVE HERE  Chicago-based hospitality company DineAmic Group is set to open their seventh venue, Bar Siena, this summer. Following the opening of their steakhouse, Prime & Provisions, and working off the success of Siena Tavern, DineAmic will open a two-story, 8,000-square-foot spin-off concept. Bar Siena will be located in the West Loop at 832 West Randolph Street at the intersection of Randolph and Green Streets.   ""When we first created Siena Tavern, much of our inspiration came from a quaint, casual and energetic bar and restaurant called La Taverna in Siena, Italy. That inspiration led us to create a more polished and expansive version better suited for River North,"" says DineAmic Group partner Lucas Stoioff. ""Bar Siena will be closer to our original inspiration in size, style and energy.""