olumbians are invited to join with Morningside Heights residents in a clean-up of Morningside Park on Sat., Sept. 27, hosted by the Young Alumni of Columbia College, New York City's Parks & Recreation Department, and Community Impact, a Columbia-sponsored community service program. The event begins at 10:00 A.M. and will last until 2:00 P.M. Volunteers should gather at the comfort station at W. 113th St. and Morningside Ave.