"Ulysses" aficionados can celebrate Bloomsday a few days in advance when the Cliff Dwellers Club, 200 S. Michigan Ave., in the 22nd-floor penthouse, plays host to readings, performances and discussions of the book at 5:30 p.m. Thursday. James Joyce's masterpiece, of course, takes place on a single day in Dublin, June 16, 1904, and he called it Bloomsday in honor of his main charatcer, Leopold Bloom. The event gets started with a cash bar, $10 admission; a dinner is available for a total of $50. The club asks reservations for either be made by June 7, by calling 312-922-8080 or by emailing reservations@cliff-chicago.org.