Weekends, July 13 – August 5: Maui Onstage Presents, Singin’ in the Rain.  The “Greatest Movie Musical of All Time” is faithfully and lovingly adapted for the stage. Singin’ in the Rain has all the makings of a Tinseltown tabloid headline; the starlet, the leading man and a love affair that could change lives and make or break careers. In silent movies, Don Lockwood and Lina Lamont are a hot item but, behind the scenes, things aren’t always as they appear on the big…