Since 1970, Diane Keaton has been delighting audiences and will always hold a place in our hearts as Woody Allen's beloved Annie Hall. Tomorrow night at 8 PM at 92Y, Keaton will appear for a special presentation to discuss her new book, Then Again, a memoir of her mother, Dorothy Hall. The lecture will be followed by a Q&A and autograph session. Tickets are $55 and each ticketholder will also receive one paperback copy of the book. 1395 Lexington Ave.