VEGAS

Vanishing Act: The Mirage Hotel--which signed Siegfried & Roy to a five-year, $50-million contract to play three weeks a month at the plush resort--will have to wait a bit longer to see dividends on their investment. Technical problems have forced the hotel to postpone the opening of the illusionists’ show from Dec. 26 to mid- or late January, hotel officials said. The showroom at the new Las Vegas Strip resort will remain dark until the show premieres.