In the family-style dining room at LuBar & Bistro, chatter from an underground bar, full-service bar drifts up the stairs, hinting at hidden revelry. A stone-fired oven for pizzas spills warmth out across the open space, skilled hands craft Italian ice cream, and spoons click against pots of housemade barbecue sauce, dressings, and marinara. Servers cruise by, transporting sandwiches and gluten-free options down to the underground lounge, where neon darts in ghosts of blue and pink off of a forest of bottles and a gleaming marbled bar. Bartenders mix drinks, ice clicking to punctuate tunes on the jukebox and occasional live music. As patrons lower glasses full of suds from Sam Adams, Hoegaarden, and Smithwick?s, big-screen TVs show sporting events and a soon-to-arrive cadre of video games?including Golden Tee?promise digital thrills. On Saturday and Sunday mornings, a breakfast buffet beckons to early risers from 8 a.m. to noon.