 Join us this evening at 8 o'clock on Maine Public Television as we bring you a Capital Fourth, America's National Independence Day celebration, honoring the country's birthday with an all-star salute and the greatest fireworks display in the nation. Hosted by Alfonso Ribeiro, this year's celebration features Smokey Robinson and Darren Criss and the National Symphony Orchestra and more. A Capital Fourth tonight at 8 with an immediate rebroadcast at 9.30 on Maine Public Television and