Now that Thanksgiving is in the past, the holiday season can officially begin. Towns across Long Island start decking the halls at annual events this weekend.

CHRISTMAS PARADES

Those who love a parade will get a special treat Saturday, Nov. 26, when the Christmas Boat Parade cruises on the Connetquot River in Oakdale at 5:30 p.m. See the procession from the Snapper Inn, View, Oakdale Yacht, Nicoll’s Point Maria, Vanderbilt’s Wharf, Great River Town Ramp and Timber Point. The parade wraps with fireworks at 7 p.m. (631-589-0248, connetquotboatparade.com)

Catch the Christmas spirt at Port Jefferson’s annual Santa Parade at 3 p.m. Saturday, Nov. 26. Watch as holiday floats, cars from Long Island Hot Rods, members of “The Nutcracker” from Harbor Ballet Theatre and Santa himself stroll down Main Street. The parade ends at Santa’s Workshop, where photos can be taken. (631-473-1414, portjeffchamber.com)

“A Storybook Christmas” is the theme of Patchogue’s 54th annual Christmas parade, 6 p.m. Saturday, Nov. 26. Kids can bring a letter to Santa to be sent to the North Pole. Add a self-addressed, stamped envelope for a response. (631-475-4302, patchogue.com)

Christmas miracles come alive in Sayville on Saturday, Nov. 26, at the 10th annual Miracle on Main Street. The day kicks off with a holiday parade at 10 a.m., followed by afternoon activities such as trolley rides, ice skating, face painting, sand art and free carousel rides. In the evening, Santa arrives with live reindeer and there will be ice sculptures, live music, a gingerbread house competition and a tree lighting as Dickens characters wander about. (631-567-5257, sayvillechamber.com)

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Fire trucks will be out in the streets of Southampton, flashing their holiday lights, at 4:30 p.m. Saturday, Nov. 26. The parade ends at Agawam Park for the Christmas tree lighting ceremony at 5, followed by a holiday party with Santa at the Southampton Cultural Center. (631-283-0402, southamptonchamber.com)

HOLIDAY SHOWS

Watch an unconventional R-rated Christmas show, “The Great American Trailer Park Christmas,” 8 p.m. Friday and Saturday, Nov. 25-26, at the Smithtown Center for the Performing Arts. This show is a sequel to the 2009 production of “The Great American Trailer Park Musical” and is not for children. ($35, 631-724-3700, smithtownpac.org) Also here: The 2003 Will Ferrell film, “Elf,” comes to life in “Elf Jr.” (condensed version for kids) at 2 p.m. Friday-Sunday, Nov. 25-27 ($15).

What’s Christmas without the “Peanuts” gang? See “A Charlie Brown Christmas” live onstage at the Patchogue Theatre for the Performing Arts at 1 and 4 p.m. Sunday, Nov. 27 ($12, 631-207-1313, patchoguetheatre.org)

SANTA ENCOUNTERS

Bells will ring in Bellmore as the Man in Red goes on a “Santa Run,” making appearances at Stop & Shop (9 a.m.), North Shore Farms (9:30 a.m.), Ace Shopping Center (10 a.m.) and the Bellmore Firehouse (10:30 a.m.) on Friday, Nov. 25. At 11 a.m., join Santa and his elves for a free movie at The Bellmore Movies at 11 a.m. (516-679-1875, bellmorechamber.com)

Pets get to sit on Santa’s lap for a photo op at the Community Pet Shop in Huntington from 11 a.m. to 5 p.m. Saturday, Nov. 26, with or without family members. You’ll get a 4-by-6-inch print for a $10 donation to the Little Shelter Animal Rescue. (631-367-1219, littleshelter.com)

SEASONAL FESTIVALS

Spend the weekend in Eastport at the inaugural Dream Come True Farm’s “Santa’s Holiday Festival” noon-7 p.m. Friday-Sunday, Nov. 25-27, in Manorville. Take in Santa’s Light Parade and get a photo with Old Saint Nick. Participate in the Christmas tree-decorating contest, then grab lunch at the food truck court. On Sunday, there’s an ugly sweater contest. (516-978-0261, longislandfoodtruckrodeo.com)

Get decorating ideas at the 27th annual Festival of Trees Friday-Sunday, Nov. 25-27, featuring an array of gingerbread villages and designer-decorated Christmas trees, which are for sale. Vendors will be on hand for holiday shopping, and each child gets to decorate a Christmas cookie. (10 a.m.-6 p.m. Friday and Saturday, 10 a.m.-5 p.m. Sunday; $15 adults, $10 ages 2-12, 516-572-4111, cradleofaviation.org)