Nights on K Street will be lit up once again by the colossal Crest Theatre marquee. A four-month restoration of the landmark neon sign wrapped up Friday when the last neon tubes were installed. Theater operators have invited the public to a relighting ceremony at 7:15 p.m. Monday -- just two weeks shy of the Crest's 60th anniversary celebration. "When I saw the first coats of paint, my first reaction was, 'That's really bright,' " said Sid Garcia Heberger, one of four people who operate the Crest. "But once I saw it in the larger context, I realized how well it works together and how right it looks." In May, Heberger and her partners hired YESCO sign company to perform a $213,000 restor