Next weekend, Nov. 9-10, is Jazz Celebration Weekend here at Lawrence. An important change has been made to the schedule. New York Voices has had to cancel their appearance on the ninth, regretfully. Chicago vocalist and pianist Patricia Barber will perform instead. The concert starts at 7:30 p.m. in the Lawrence Memorial Chapel. Any tickets previously purchased for New York Voices will be honored for the Barber concert. A more detailed review of the Jazz Weekend will come in The Lawrentian next week.