The Women's Choir Festival, hosted by the Pitt's Women's Choral Ensemble, invites choirs from Duquesne University, Seton Hill University, Westminster College, and Fox Chapel Area High School for a concert of classics, folk arrangements and popular music at Bellefield Hall Auditorium, Oakland at 3 p.m. Tickets are $5-$15; visit www.proartstickets.org or call 412-394-3353.

Canadian-born Michael Unger is an organist of the first rank. Bad puns aside, he did take first place at the American Guild of Organists national young organist competition in 2008, and he will bring his winning form to the 4,272 pipe organ of Heinz Memorial Chapel at 4 p.m. Sunday. The concert, program TBA, is being co-presented by the Organ Artists Series of Pittsburgh. $5-$12; call 412-242-2787 or visit www.oas-series.com.

Junot Diaz, the Pulitzer Prize-winning author of "The Brief Wondrous Life of Oscar Wao," speaks at the Carnegie Music Hall, 4400 Forbes Ave. in Oakland, as part of the Drue Heinz Lectures at 7:30 p.m. He writes about immigrant, urban life and is funny, irreverent and profane, "one of contemporary literature's most distinctive and irresistible new voices." The New Yorker says he's one of 20 writers to watch in the 21st century. For tickets, $15, $25 and $10 for students with ID, call Pittsburgh Arts & Lectures at 412-622-8866.

Elaine A. King, guest curator of the exhibition "LIKENESS," will speak on "Human Portrayal: A Shifting Conglomerate of Media & Social Values," at 7 p.m. at the Mattress Factory museum, 500 Sampsonia Way, North Side. A guided exhibition tour will precede the talk at 6 p.m. ($10, members and Pitt and CMU students free; for information, call 412-231-3169 or visit www.mattress.org).

New Horizon Theater, Inc., presents the Pulitzer Prize-winning play "Topdog/Underdog" at 7:30 p.m. at the Grey Box Theatre, 3595 Butler St., in Lawrenceville. Suzan Lori-Parks riveting tale of two African-American brothers, Lincoln and Booth, examines race relations through a prism of sibling rivalry.

Tickets -- $20 adults, $15 for seniors and students -- are available at Dorsey's Record Shop, 7614 Frankstown Ave., the theater box office an hour an a half before showtime or by mailing Box 40102, Pittsburgh, PA 15201. There also will be 3 p.m. Sunday matinees. The show runs through Nov. 22. For more information call New Horizon Theater at 412-431-0773.

"David Cale: Palomino" in the Warhol Theater at the Warhol Museum at 8 p.m. "Palomino," the gifted storyteller's new solo show, is "a meandering tale told from six perspectives, focusing on the adventures of an enigmatic, handsome Irish horse-drawn carriage driver in New York City's Central Park," according to the museum's Web site. Cale, the author and performer of six nationally acclaimed solo shows and a lyricist for The Jazz Passengers, has appeared in several Broadway shows. For tickets, $20 for adults and $10 for students and Carnegie Museums of Pittsburgh members, call 412-237-8300 or visit www.ticketweb.com.

The Pittsburgh Cultural Trust Pittsburgh Pundits Series Presents: The John McIntire Dangerously Live Comedy/Talk Show -- Thanksgiving Edition, "THANKS BUT NO THANKS -- THE PEOPLE WHO RUIN IT FOR THE REST OF US" at Cabaret Theater, Seventh Street and Penn Avenue, Downtown, at 10 p.m. Panelists include Post-Gazette Columnist Sam Bennett and two other "annoyed panelists" to be named later. With comedy by alternative comedian Gab Bonesso and McIntire. Admission, $5. For more information call 412-325-6769.

Critics Andrew Druckenbrod and Scott Mervis talk about music on "The Beat," available exclusively at PG+, a members-only web site of the Pittsburgh Post-Gazette. Our introduction to PG+ gives you all the details.