Festival of Trees Gala 6 p.m., Vacaville Skating Center, 551 Davis St., Vacaville. Dinner buffet and a live auction. Tickets. Info: http://www.vacavillefestivaloftrees.com.
Suisun Valley 4-H Club meeting 7 p.m. Monday, Cordelia Fire Hall, 2155 Cordelia Road, Fairfield.
Fairfield-Suisun Rotary Club Noon to 1:30 p.m., Hilton Garden Inn, 2200 Gateway Court, Fairfield. Info: 483-8196.
Solano County Soroptimist Club Noon to 1:30 p.m., Hilton Garden Inn, 2200 Gateway Court, Fairfield. Info: 422-6800.
Merriment on Main 4:30 to 9 p.m.,Tuesday, Downtown Vacaville. Tree lighting, singing of carols, a live Nativity scene and Santa! Info: www.downtownvacaville.com.
Fundraiser for Williams Syndrome 1 to 9 p.m., Friday, Chevy’s Fresh Mex Restaurant, 1730 Travis Blvd. Info: 425-5181.
Fairfield Christmas Tree Lighting 6 p.m. with Santa’s arrival at 7 p.m., Friday, Town Hall Green, Fairfield. Includes performances by the Bridgeport Theatre Company, the Fairfield Woods, Roger Ludlowe and Tomlinson Middle School Chamber Choir, and the Fairfield Warde Choral Group. Info: www.cal.fairfieldct.org.
Holiday Open House and Tree Lighting 6:30 p.m., Friday, at the foot of First Street, Benicia. Tree lighting and music by Kris Kringle and The Mistletones. Info: 745-9791.
Vanden High Sack Attack Competition 9 a.m. to 5 p.m., Saturday, Vanden High School, 2951 Markeley Lane, Fairfield. Twenty-five teams of robot-building students put their skills to the test in a series of robot challenges against teams from other schools. Info: www.vexrobotics.com or www.robotevents.com.
Christmas at the Waterfront noon to 8 p.m., Saturday, Harbor Plaza, Main Street at Solano Street, Suisun City. Activities include a skate rink sponsored by PG&E, arts and crafts, a bonfire, a lighted boat parade at 5:15 p.m. and the lighting of the Christmas tree following the boat parade. Info: www.visitsuisuncity.com.
Mad Hatter Holiday Parade and Festival 4 p.m., Saturday, Historic Downtown Vallejo, Georgia Street to the Waterfront. Celebrating the 160th birthday of Alice in Wonderland. The Mad Hatter Parade begins at 4:30 p.m. at Marin and Georgia Street. The tree lighting will be held after the parade, followed by the lighted boat parade on the waterfront. The Mad Hatter Masked Ball will be at 7 p.m. at Alice’s Palace, 620 Marin St..
Holiday Vendors Fair 10 a.m. to 6 p.m., Sunday, Courtyard Marriott, Vacaville. Shop, see all the latest products, and try out samples. Info: firstname.lastname@example.org.
Winter Plant Sale 8 a.m. to 8 p.m. Dec. 6, 8 a.m. to 5 p.m. Dec. 7, 9 a.m. to 2 p.m. Dec. 8. Sponsored by the Horticulture Club of Solano Community College, featuring holiday wreaths and swags made by the Horticulture Department, as well as seasonal flowering plants, house plants and succulents. Proceeds provide scholarships, equipment and reference materials for SCC Horticulture students. Info: 486-0179.
Chief Solano Kennel Club, Inc. 7:30 p.m., Dec. 6, Elmira Fire Station. Meeting open to everyone. Info: 446-7492 or www.chiefsolanokennelclub.org.
Disaster Preparedness Awareness Workshop 7 p.m., Dec. 7., 2500 N. Texas St., Fairfield. “Be Red Cross Ready,” presented by Harvest Family Life Center. Seating is limited. Reservations: 422-5200, email@example.com.
Diablo Regional Concert Band winter concert 7:30 p.m., Dec. 7, Benicia Public Library, Fireplace area,150 E. L St., Benicia. Sponsored by the Friends of the Benicia Public Library. Conductor: Cora Martens. Info: 746-4343, www.benicialibrary.org.
Christmas Parade and Holiday Market 10 a.m., Dec. 8, First Street, Benicia. Parade starts at First and D streets, and continues along First Street, ending at H Street. Holiday market hours are 10 a.m. to 3 p.m, located on First Street between B and D streets. Info: 745-9791.
Library Book Sale 10 a.m. to 4 p.m., Dec. 8, Benicia Public Library, 150 E. L St., Benicia. Sponsored by the Friends of the Benicia Public Library. Info: 746-4343.
Interpretive Walk on Quail Ridge 1 to 5 p.m., Dec. 8, Quail Ridge Reserve at the southern end of Lake Berryessa. Walk the scenic hillsides of California to see native grasses, shrubs and trees, and learn about the wildlife and native habitats. Led by QRWC executive director Frank Maurer. Walkers will gather at Markley Cove Resort. Reservations, directions and info: 530-219-4477.
U-Jam Fitness Class and Toy Drive 3 to 5 p.m., Dec. 8, Kroc Center, 586 E. Wigeon Way, Suisun City. As admission price, please bring at least one toy for a child to received for Christmas this year. Toys must be new and unwrapped. Info: www.facebook.com/events/292244307560675/.
Vallejo Choral Society 3 p.m., Dec. 9, First Presbyterian Church, 1350 Amador St., Vallejo. Grammy award winner Andrew Brown conducts the Vallejo Choral Society, Vallejo Symphony and Campanelli Children’s Chorus in Britten’s Saint Nicolas Cantata featuring tenor Steven Ziegler, Biebl’s Ave Maria, an many more traditional carols. Tickets and info: 653-6827 or 643-4441.