What's happening the next few weeks:
* Farm Aid '98 comes to the New World Theatre Oct. 3 with Willie Nelson, right, Neil Young, John Mellencamp, Phish, Hootie & the Blowfish, Martina McBride and Steve Earle scheduled to perform. 19100 S. Ridgeland, Tinley Park. (312) 559-1212.
* At the Art Institute of Chicago Oct. 13-Jan. 10, "Mary Cassatt: Modern Woman" brings together approximately 100 of the artist's paintings, pastels, drawings, and prints. 111 S. Michigan Ave. (312) 443-3600.
* Brian Dennehy plays Willy Loman in Arthur Miller's "Death of a Salesman" through Nov. 7 at the Goodman Theatre, 200 S. Columbus St. (312) 443-3800.