CHARLESTON — Thousands of people attending Charleston's SC250 Fourth of July celebration at Waterfront Park got an early taste of the Holy City’s upcoming new burger joint on the harbor. CurrentBurger handed out more than 2,000 samples from its forthcoming menu of burgers, fries and milkshakes as crowds gathered ahead of the evening's fireworks display. The city’s newest luxury hotel is expanding its culinary lineup with a new coffee shop, burger restaurant and fresh dining experiences.