Great eBay deals: The online marketplace observes its 20th anniversary with $20 headphones, watches and blenders for sale at its decorated Airstream parked at Fisherman’s Wharf. [10 a.m. to 6 p.m., Pier 41, S.F.]

Comedy night at Kepler’s: Adam Mansbach, bestselling author of “Go the F* to Sleep,” and Alan Zweibel, Emmy Award-winning writer who has worked on “Saturday Night Live” and “Garry Shandling’s Show,” appear live. [7:30 p.m., 1010 El Camino Real, Menlo Park]

Jonathan Franzen: The National Book Award winner and Pulitzer Prize nominee reads from and discusses his new novel “Purity.” [7 p.m., Books Inc., 601 Van Ness Ave., S.F.]

Ask Ariely: Israeli American behavioral economist, bestselling author and Wall Street Journal advice columnist Dan Ariely appears to promote his new book “Irrationally Yours: On Missing Socks, Pickup Lines, and Other Existential Puzzles.” [8 p.m., Jewish Community Center, 3200 California St., S.F. ]

Carey Perloff: American Conservatory Theater’s artistic director reads from her memoir “Beautiful Chaos: A Life in the Theater.” [7 p.m., Presidio Officers Club, 50 Moraga Ave., Presidio of S.F.]

Lily Iona Mackenzie: The University of San Francisco writing instructor talks about her debut novel “Fling!” a funny tale of a 90-year-old woman named Bubbles and her 60-year-old daughter who go on a quest. [7 p.m., Green Apple Books, 506 Clement St., S.F.]

Lauren Hirshfield Belden: The author talks about “The Places You’ll Feed!” an amusing children’s book parody for new mothers inspired by her own experiences. [7 p.m., Folio Books, 3957 24th St., S.F.]


Brian Wilson: SFJAZZ presents the Beach Boys genius in concert at Davies Symphony Hall. [8 p.m., 201 Van Ness Ave., S.F.]

Not Your Mother’s Book Club: Debut author Nicola Yoon shares “Everything, Everything” and New York Times-bestselling author David Levithan discusses his new novel, “Another Day.” [7 p.m. Books Inc., 601 Van Ness Ave., S.F.]

Jane Ward: The UC Riverside professor reads from her provocative new book “Not Gay-Sex Between Straight White Men.” [7 p.m., Modern Times Bookstore, 2919 24th St., S.F.]

Kathleen Alcott: The writer discusses her second novel “Infinite Home,” which tackles the question: What makes a home a home? [7:30 p.m., Green Apple Books, 1231 Ninth Ave., S.F.]

Cuts for a cause: Men’s grooming company Wahl is honoring San Francisco’s No. 4 spot on the list of “Most Facial Hair Friendly Cities in America” by offering free facial hair trims (and donating $1 for each one done to prostate cancer research) at its mobile barbershop. [11 a.m. to 6 p.m., Pier 39, S.F.]

Food talk: Emmy Award-winning documentary producer and historian Libby H. O’Connell speaks about her book “The American Plate: A Culinary History in 100 Bites.” [4 p.m., Latino Hispanic Rooms, Main Library, 100 Larkin St., S.F.]

Bernal Heights Outdoor Cinema: The weekend neighborhood series continues with “Film Crawl on Cortland,” a presentation of short screenings running simultaneously throughout the evening. [7 to 10 p.m., Cortland Avenue, between Bennington and Anderson streets, S.F.]