As that Halloween door creeps open to unveil a Pandora’s box of scary surprises, people in California are in a frenzy as to what to see and do, since this Halloween 2011 makes for four days of celebrating–Friday, Saturday, Sunday and Monday. Pace yourself. Pick and choose. And remember, Halloween will return again in 365 days. Here are a few of hundreds of events for Sunday, October 30, 2011. See more events!

• AZUSA 8th Annual Trunk or Treat Car & Truck Show. Time: 12 noon – 4 p.m. ci.azusa.ca.us
• BENICIA – Halloween Events 2011 – Haunted Depot. BeniciaMainStreet.org
• BUENA PARK – Knott’s Berry Farm Scary Farm Haunt. Time: 7 p.m. – 1 a.m. Cost: $34-51 presale, $57 walk up day of. Location: 8039 Beach Boulevard, Buena Park, CA. Call: (714) 220-5200.knotts.com. Dates for this special event include: Sept. 23-25; 29-Oct. 2; Oct. 5-9; Oct. 12-16; Oct.19-23; Oct.26-31. Open 7p-2am Friday & Saturday only. All other days 7p-1 am
• ESCONDIDO – Fall Renaissance Faire October 29 & 30, November 5 & 6, 2011, Felicita County Park , 742 Clarence Lane, Escondido, CA. goldcoastfestivals.com/li>
• EUREKA – Boo at the Zoo. Bring the whole family for a frighteningly good time. Learn about creatures that crawl and creep, slime and slither, and lurk in the shadows of the night, participate in games, crafts and activities. 10 a.m. – 2 p.m. Eureka, Sequoia Park Zoo 3414 W Street Eureka, CA 95503 Zoo admission $5.50 adult, $3.50 child, free under age 2. (707) 441-4263. sequoiaparkzoo.net
• HERMOSA BEACH – Skecher’s Pier to Pier. Stroll on the strand, from Manhattan Beach Pier to the Hermosa Beach Pier and back, while raising funds for our education system and children with special needs. At the finish line, live music and entertainment, refreshments and exciting activities welcome everyone, all ages invited! Time: 9:30 a.m. to Noon. pier2pierwalk.com
• IRWINDALE Halloween Spooktacular. Cake walk, bingo and traditional games and contests bring old-fashion fun!
• LEUCADIA – Farmers Market. Time: 10 a.m. to 2 p.m. Paul Ecke Elementary School, Leucadia, CA. Call: (858) 272-7054. leucadia101.com
• LONG BEACH – Dark Harbor Halloween Haunt at Queen Mary. Cost: $20 -60. queenmary.com
• LONG BEACH – Comic & Horror Con. A convention celebrating comic books will include costumes, writer panels, author sessions and signings and more. Time: 10 a.m. – 7 p.m.; Sunday 10 a.m. – 5 p.m. Location: 300 E. Ocean Blvd., Long Beach longbeachcomiccon.com
• OAKLAND – Boo at the Zoo, October 29 – 30, 2011 10 a.m. to 3 p.m.. Oakland Zoo, 9777 Golf Links Road, Oakland, CA . (510) 632 9525. oaklandzoo.org
• OCEANSIDE – Dia de los Muertos Festival. Day of the Dead transforms Old Mission San Luis Rey with mariachi bands, local ballet folklorico dancing groups, Aztec entertainers and elaborate alters. Time 10 a.m. to 4 p.m. Cost: Free. Location: Call (619) 233-5008. sanluisrey.org
• PLEASANTON – Pirates of Emerson. 6 Haunted House attractions include the original, infamous Pirates of Emerson, plus a and Corn Maze. The Haunting Fields is where your worst nightmares become real. As you enter the Adventure, you enter a world of suspense and terror. The only thing on your mind will be your survival. At the Haunting Fields you are actually IN the various exotic scenes. Time: 7:05 – 10 p.m. Cost: $20 General Admission. Location: Alameda County Fairgrounds, 4501 Pleasanton Ave., Pleasanton, CA. piratesofemerson.com. Other dates: Oct. 1, 7-9, 13-16, 19- 23, 25-31
• SACRAMENTO – Boo at the Zoo Sun., Oct. 30 & Mon. Oct.31, 2011 5 to 8 p.m. Tickets: $10; age 1 and under Free. 3930 West Land Park Drive Sacramento, CA (916) 808-5888 saczoo.org
• SANTA ANA – Boo at the Zoo October 22, 23, 24, 29, 30, 2011 5 – 8:30 p.m. Cost: $12, under age 2 is free. Location: Santa Ana, Prentice Park Zoo, 1801 East Chestnut Avenue, Santa Ana, CA 92701 . Call: (714) 647-6575. santaanazoo.org/boo.htm
• VALLEJO – Fright Fest at Six Flags Discovery Kingdom 2011, through Oct. 30, 2011. Location: 1001 Fairgrounds Dr., Vallejo, CA. Call: (707) 643-6722. Fright Fest is all-new and scarier than ever before, bringing thrills by day and FRIGHT by night! Northern California's biggest Halloween event is resurrected into a terror-filled playground. As the clock strikes 13, an unearthly Awakening at the gallows awaits you. With five new haunted attractions, street entertainment, and hair-raising haunted houses and mazes. sixflags.com/discoverykingdom