Bush’s orchestra, uni October.* * *The Algonquin Supper Club, j ^ which last season proved to be one as of Manhattan’s main after-theatre focal points, will re-open next Wednesday night. Greta Keller, the I Continental chanteuse, will again resume her double-duty as entertainer-in-chief and hostess. Miss Keller will sing an all-new program of songs, as well as many of last season’s favorites, and will in addition offer a brand new form of entertainment in a specially-written series of short dramatic-musical sketches.Cy W'alter, the youthful pianist who is both Miss Keller's accompanist and a star in his own right, will again be on hand to entertain with his original pianistics. In addition, the chanteuse will present her new protege, Eddie Mayehoff, the impressionist who is well-known to radio fans for his delineations of characters found on the streets of New York.Prank Case, proprietor of the Hotel Algonquin, has re-appointed John Martin, the celebrated host-elery’s afTable manager, to again serve in a supervisory capacity over the Supper Club.