After bouncing around the city for several years, Wigstock-New York's annual Labor Day weekend outdoor drag-fest-has put down roots on Pier 54 on the Hudson River. The performers, who always include a few dewigged guys and biological females, dazzle the enthusiastic audience with a marathon show of song, dance, costumes and snappy one-liners. Snappiest of them: Lady Bunny, Wigstock's grand dame and laugh-a-minute raunchy hostess.