NYMFomaniacs, rejoice! The impressive annual feast of new musical theater takes over multiple venues on 42nd Street for its 15th annual edition. Selections include more than 30 productions, readings, concerts and other events. Among the full stagings: Jamie Leo and Paul Leschen's ‘68: A New American Musical, about the chaotic 1968 Democratic Convention in Chicago; Keith Harrison and Laura Nicole Harrison's Emojiland, in which pictographs are threatened by a software update; Abby Payne's Wild West story The Gunfighter Meets His Match; J. Jarrett's Wonder Boi, about a transgender superhero; and a concert version of Fatty Fatty No Friends, a hit at the 2014 Fringe Festival. Buried treasure could lie anywhere, so dig around.