PETALUMA HALLOWEEN HOUSE TOUR Visit historic parlors decorated in a Halloween theme. Costumed docents at each location will share the homes' history and lore. 6-9 p.m. $15 general, $5 for kids age 12 and under. 762-3456. www.heritagepetaluma.com.
TRUNK OR TREAT Trick-or-treating from cars, jump house, hayrides, fortune teller, haunted house, games, crafts for kids under 10. 3-5 p.m. First United Methodist Church, 2150 Giffen Ave., Santa Rosa. 545-3863.
"BOO AT THE ZOO" Entertainment, games, arts and crafts, trick-or-treating, haunted nature trail, insect zoo, haunted miniature steam train rides, costume, music, species altar. 10 a.m.-5 p.m. Free with paid admission to the zoo, $5-$11. San Francisco Zoo, Sloat Boulevard at 47th Avenue. (415) 753-7080.
"WITCHIE POO HALLOWEEN EXTRAVAGANZA MYSTERY" Witchie Poo's dress has disappeared, along with her magical powers. Musical mystery. Costumes encouraged. 2:30 p.m. $6-$9. Sebastiani Theatre, 476 First St. East, Sonoma. 996-9756.
HEALDSBURG TWILIGHT TOUR A walk down Healdsburg's vintage side streets, with tales of star-crossed romance, mystery, history and ghostly sightings. 7:30-9 p.m. $20. Adults and teenagers only, reservations required. 484-6249. www.healdsburg
HALLOWEEN AT THE LIBRARY Free. Costumes, trick-or-treating, crafts and games for ages four and up: 11 a.m. today, Rincon Valley Library, 6959 Montecito Blvd., Santa Rosa.
Scary stories for ages seven and up: 7 p.m. Monday, Windsor Library, 9291 Old Redwood Highway, Windsor.
Costumes, stories and songs for children up to age 5, 11 a.m. Tuesday, Healdsburg Library, Piper and Center streets, Healdsburg.
Not-so-scary stories and costumes: 6:30 p.m. Tuesday, Sebastopol Library, 7140 Bodega Ave., Sebastopol.
Stories, costume parade, treats and a craft: 11 a.m. Wednesday, Rincon Valley Library, 6959 Montecito Blvd., Santa Rosa. 545-0831. www.sonomalibrary.org.
DR. EVIL'S HOUSE OF HORROR 7-11 p.m. today, Monday and Wednesday. $6 adults, $4 age 14 and under. Not suitable for young children; there will be a kid-friendly area on Halloween night from 6:30-8:30 p.m. 16101 Neeley Road, Guerneville. 869-1712.
HALLOWEEN COSTUME DANCE Steve Balich Band, costume contest. 1-4 p.m. $6. Senior Center, 704 Bennett Valley Road, Santa Rosa. 545-8608.
HALLOWEEN PARADE AND HOT DOG ROAST Parade begins 6 p.m. in front of Raley's Supermarket at the Lakewood Shopping Center, Lakewood Drive, Windsor, and ends at the Windsor Community Center. Free hot dogs, drinks and candy provided for all parade participants. Windsor Lions Club. (619) 275-3200.
HALLOWEEN COSTUME PARTY Benefits Sutter VNA Hospice and the American Cancer Society. 8 p.m.-midnight. Occidental Community Center, 3920 Bohemian Highway. 827-3390.
HALLOWEEN PARTY Music by Gator Beat. 8-11 p.m. $10; $5 students. Moose Lodge, 20580 Broadway, Sonoma. 996-7444.
THE MORTUARY ORCHESTRA OF GUERNEVILLE Joseph Gold on violin, performing Tartini's "The Devil's Trill;" "Dracula" by Stephen Whithead for strings and narrator with Mark Gregory, narrator, and Roberto Gonzalez, conductor; original ghost music for guitar and strings by Jaume Torrent; Seth Monfort will perform Chopin's "Funeral March Sonata." 8 p.m. $20. Russian River Performing Arts Center and Conservatory, 16374 Fourth St., Guerneville. 604-7600. www.sfconcerto.org.
TRICK-OR-TREAT TRAIL Petaluma merchants, marked by orange and black balloons, will pass out candy to trick-or-treaters, 3-5:30p.m. on Kentucky, Fourth, Second and C streets, Western Avenue, Petaluma Boulevard and the Golden Eagle Shopping Center in Petaluma. 762-9348. www.
DAY OF THE DEAD
DAY OF THE DEAD FINE ART EXHIBITS Includes "Altares con Ofrendas," through Saturday, in Petaluma. Maps at the library, 100 Fairgrounds Drive, the Historical Museum, 20 Fourth St., and downtown stores. 778-9922. www.PetalumaArtsCouncil.org.