It looks like Williamsburg’s many music venues are going to have to move over and let one more in, but something tells us this might not be the kind of competition they would ever be expecting. Opera Oggi New York s is opening the doors of MacCaddin Memorial Hall Theater at 288 Berry St. “Rehearsals, started this week, are already bringing serious opera back to the theater,” with the first performance to be L’Oracolo, by Leone, November 6, 7 and 8.–Neighborhood Watch