In its New York stage premiere, "�Figaro! (90210), a modern adaptation of Mozart's "The Marriage of Figaro," imagines Figaro and Susana as undocumented workers in the mansion of a Beverly Hills real estate mogul. Condensed to two-and-a-half hours, the opera is performed in Vid Guerrerio's new English (and Spanglish) version of the original Italian libretto. Melissa Crespo is the director; Raphael Fusco conducts. (Previews begin Saturday; opens on Thursday.)