(performances begin on Wednesday) As director of Public Works at the Public Theater, Lear de Bessonet has been known to corral more than 200 amateur actors for a musical version of "The Tempest." So marshaling a mere six professional thespians for the Encores! revival of this 1981 musical must seem like a holiday. Jordan Dean, Hunter Foster, Randy Redd and Lorenzo Wolff are the grease monkeys while Mamie Parris and Katie Thompson are the diner waitresses in this sweet and sassy country-rock show.