Mars Bar: Despite its totally space-age name, Mars Bar is bereft of any Martian theme, focusing instead on its less geeky attributes, such as a sweet patio, a rotating cast of DJs and a snazzy lunch menu. [798 Brannan St., S.F.; (415) 621-6277, www.marsbarsf.com]
Dark side: The Royal Underground Theatre Company presents “Jekyll & Hyde: The Gothic Musical,” a play based on the classic tale of good versus evil. [8 p.m., Southside Theatre, Building D, Fort Mason Center, S.F.]
Palace poltergeists: San Francisco City Guides presents its annual “Ghost Walk” at the Palace Hotel — a site of high-profile deaths and related ghostly lore. [6:30 p.m.; meet at main-entrance lobby, 2 New Montgomery St., S.F.]
This urban village was once a Mexican land grant. Then came the land speculators, followed by Ligurian and Tuscan truck farmers. Hear stories of the past and present. 10 a.m. Meet at the Excelsior Library, 4400 Mission St. at Cotter.
San Francisco City Guides, a 31-year-old nonprofit organization conducting free walking tours spotlighting San Francisco history, architecture, legends and lore, is a program of the San Francisco Public Library. Tours offered seven days a week year round. Visit www.sfcityguides.org or call (415) 557-4266 for more information.
Horror classic: The San Francisco Symphony presents “Nosferatu,” F.W. Murnau’s classic silent vampire film. Organist Dennis James plays Hans Erdmann’s score. [8 p.m., Davies Symphony Hall, 201 Van Ness Ave., S.F.]
Wrap artists: “Very Postmortem: Mummies and Medicine” opens. The exhibit features the mummy of Irethorrou (an Egyptian priest), and looks — via today’s science — at how he lived. [9:30 a.m. to 5:15 p.m., Legion of Honor, 100 34th Ave., S.F.]
Scary science: The Exploratorium hosts “Creature Features” — giant insects, carnivorous plants, spooky films and a “haunted Victorian house on wheels,” among other frightful attractions. [3 to 8 p.m., 3601 Lyon St., S.F.]
Legendary cartoonist: Underground-comics founding father Robert Crumb unveils his “Book of Genesis” and talks with Francoise Mouly of the New Yorker. [8 p.m., Jewish Community Center, 3200 California St., S.F.]
Baroque requiem: San Francisco Renaissance Voices presents its annual “Halloween Weekend Concert.” Featured piece: Jean Gilles’ “Messe des morts.” [7:30 p.m., Seventh Avenue Performances, 1329 Seventh Ave., S.F.]
Street chase: Players try to get through checkpoints on foot or by public transit, without being caught by chasers, in “Journey to the End of the Night,” a citywide tag game. [7 p.m., Justin Herman Plaza, 1 Market St., S.F.; www.sfzero.org]
Shadow theater: Leonidas Kassapides, specializing in Greek shadow puppetry, performs “The Metamorphosis of Karaghiozis,” an adventure comedy. The show includes live music. [7 p.m., Union Square, 333 Post St., S.F.]
Costume parade: Kids under 10 and their families can take part in the “Gardens Halloween Costume Walk.” The event also includes performances. [Noon to 2 p.m., Yerba Buena Gardens, Howard and Fourth streets, S.F.]
Macabre music: Stanford University hosts its Halloween concert. Expect “ominous overtures, menacing marches and other decompositions.” [8 p.m., Dinkelspiel Auditorium, Stanford University, Stanford]
San Francisco Birding by Bike
Join SFBC members Annie and David Armstrong for a pedal-powered introduction to San Francisco’s avian life. The ride will look for some of the more than 300 resident, migrating and overwintering bird species that can be found in S.F., proceeding at a relaxed pace through Golden Gate Park, on Ocean Beach and around Lake Merced where you’ll look for ducks, waders and shorebirds. The ride is mostly level and covers around 20 miles, and all skill levels are welcome. Please bring binoculars; rain cancels.
Meet at: meet at Vélo Rouge Café, Arguello Boulevard at McAllister Street. Time: 9 a.m.-1 p.m.,
— San Francisco Bicycle Coalition; sfbike.org
Jazz giant: San Francisco Jazz Festival events include an evening with alto saxophonist John Handy, recipient of the festival’s 2009 SFJazz Beacon Award. [7 p.m., Herbst Theatre, 401 Van Ness Ave., S.F.]
Love and horror: Black Box Theatre Company presents “The Creature” — playwright Trevor Allen’s retelling of “Frankenstein,” from the monster’s point of view. [7 p.m., Thick House, 1695 18th St., S.F.]
Ghost tales: Storyteller Brenda Wong Aoki and jazz artist Mark Izu perform “Japanese Ghost Stories and Jazz,” a post-Halloween family concert. [2 p.m., Yoshi’s, 1330 Fillmore St., S.F.]
Author reading: Moroccan expatriate Abdellah Taia, the first openly gay autobiographical writer published in Morocco, reads from “Salvation Army,” his new novel. [5 p.m., City Lights Bookstore, 261 Columbus Ave., S.F.]
Something old: Seventy dealers sell fine and decorative arts at the San Francisco Fall Antiques Show. The event benefits Enterprise High School students. [Noon to 6 p.m., Festival Pavilion, Fort Mason Center, S.F.]
String quartet: The St. Lawrence String Quartet performs quartets by Haydn. A talk precedes the concert. [Concert at 2:30 p.m.; talk at 1:30 p.m.; Dinkelspiel Auditorium, Stanford University, Stanford]