Once the Thanksgiving leftovers are packed in the fridge, it will be time to switch from dressing the turkey to dressing up your home for the holidays. Over the next few weeks, a number of historical societies, community organizations and nonprofits are hosting holiday house tours to benefit their organizations and help Long Islanders get into the decorating spirit.


The Southold Historical Society will be among the first to usher in the holiday season with its annual candlelight tour and tree lighting. The period buildings that make up the society's museum complex will be decorated, with candles and lanterns lighting the way through the grounds during the tour, which will take place from 3 to 6 p.m. There will be demonstrations of farm and home crafts, strolling musicians, a visit from Santa and refreshments. The Christmas tree in front of the Ann Currie-Bell House will be lit at 5 p.m., with caroling led by the Southold High School chorus ensemble. The tour is free, and no reservations are required. For information, call 631-765-5500 or visit southoldhistoricalsociety.org.


The East Hampton Historical Society's self-guided tour will run from 1 to 4:30 p.m. and will showcase some of the finest examples of historic and modern architecture in the Hamptons, including interior designer David Netto's seaside hexagonal house nestled in the Napeague dunes in Amagansett. Tickets are $65 in advance and $75 the day of the tour. There will be an opening night cocktail party Friday. Tickets to the party are $200, which includes entry to the house tour. Tickets can be purchased at the East Hampton Historical Society office, 101 Main St., Tuesday through Saturday from 10 a.m. to 3:30 p.m., by calling 631-324-6850 or visiting easthamptonhistory.org. They can also be purchased Nov. 29 and 30 between 10 a.m. and 3:30 p.m. at Clinton Academy, 151 Main St.


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North Shore Holiday House, a residential camp for girls ages 7 to 11, will provide a look at other "holiday houses." The camp's eighth annual Deck the Halls house tour and benefit will take place from 10 a.m. to 4 p.m. and includes a tour of homes in the Lloyd Harbor area and lunch at Honu Kitchen & Cocktails in Huntington. There are two lunch seatings, at 11:30 a.m. and 1:30 p.m. Tickets are $75 in advance, $100 the day of, and are available at 631-427-7630 and nshh.org.


The Three Village Historical Society's 35th annual Candlelight House Tour will showcase homes dressed in holiday finery by a volunteer team of local decorators. The Friday evening tour includes a reception at the Three Village Inn in Stony Brook, while Saturday's tour includes the option of breakfast at the Stony Brook Yacht Club. Tickets range from $40 to $100 and can be purchased at the society's historical center at 93 North Country Rd. in Setauket. Call 631-751-3730 or visit tvhs.org.

DEC. 6, 7 and 8 - PORT JEFFERSON

Don't be a humbug about holiday decorating and head to Port Jefferson Village's 18th annual Dickens Festival Dec. 6, 7 and 8. The annual celebration of Charles Dickens, author of "A Christmas Carol," features a lantern-lit tour of Victorian homes from 4:30 to 8:30 p.m. Saturday organized by the Port Jefferson Chamber of Commerce. For more information, call 631-473-1414 or visit portjeff.com.


Five Amityville homes will be filled with the sights and smells of the holidays for the Kiwanis Club of Amityville's Holiday Homes Tour. The tour will take place from noon to 4 p.m., with a tree lighting ceremony at 5 p.m. in the center of the village. Tickets are $20 and can be purchased at Johnson's Florist, 86 Broadway; Bella Maison, 137 Merrick Rd.; Self Image Salon, 180 Broadway; Cornucopia Noshery, 194A Park Ave.; Elegant Additions, 185 Broadway; the Lauder Museum, 170 Broadway; and Harbor Light Realty, 90 Montauk Hwy. On the day of the tour, tickets can be purchased at any of the homes, or at the Masonic Lodge, 14 Avon Place, where refreshments will be served. Proceeds will be used by the Kiwanis Club of Amityville for community projects. For details, email holidayhomestour@aol.com or call 631-691-8435 between 8 a.m. and 8 p.m.


See one of Long Island's grandest homes, the Vanderbilt Mansion, decorated for the holidays at a popular holiday dinner. The evening includes cocktails, a tour of the decorated mansion, dinner in the glass-walled Northport Porch overlooking the harbor, and dessert in the Lancaster Room. Seatings will be at 6 and 8 p.m. The cost is $100 per person and the event sells out quickly. Tickets can be purchased at 631-854-5579. The deadline is Nov. 29.

DEC. 7 and 8 - BAY SHORE

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"Here We Come a Caroling" is the theme at Sagtikos Manor. Each room of the first floor of the house, at Montauk Highway and Manor Lane in Bay Shore, will be decorated around a Christmas carol. There will be hot drinks and cookies, and the Friends of the Manor Gardens will sell decorative greenery. The gift shop will offer holiday items and decorations for sale. Tours leave every 15 minutes starting at 11 a.m. both days, with the last tours given at 3:15 p.m. Visitors can reserve a preferred time of entry. The cost of the tour, for those who reserve by Dec. 4, is $20 for adults, $15 for seniors and students and $5 for children ages 5 to 12. The cost is $25 for adults and $5 for children on the day of. For more information, call 631-957-1133 or visit sagtikosmanor.com.


The Huntington Historical Society will provide an inside look at five historic homes, all decorated for the holidays. This year's tour takes place from noon to 4 p.m. starting at the Conklin House Museum, 2 High St. Tickets are $35 for members, $40 for nonmembers; they are limited and should be purchased in advance. A ticket and map, along with a brochure describing the houses, will be mailed the week before the tour. For more information, call 631-427-7045, ext. 401, or visit huntingtonhistoricalsociety.org.


The Historical Society of Islip Hamlet will hold its 20th annual holiday house tour from noon to 5 p.m. Tours of several historically or architecturally significant homes will be given by guides in Victorian dress. The tour includes a reception in one of Islip's historic churches with light refreshments, entertainment, a raffle and an auction. Visitors are encouraged to bring a new, unwrapped toy for the Toys for Tots campaign. Tickets are $20 in advance and $25 on the day of the tour for people 16 and older. They can be purchased Tuesday through Saturday from 10:30 a.m. to 6 p.m. at Nook & Cranny Gift Boutique, 469 Main St. Only cash or checks will be accepted. Payment can also be mailed to the historical society at P.O. Box 601, Islip 11751. For more information, call 631-245-0675.

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The Northport Historical Society's popular Homes for the Holidays tour will feature some of the village's finest properties in full holiday splendor. The tour will run from noon to 4 p.m. The cost is $25 for members, $30 for nonmembers. Reservations are strongly encouraged, and they can be made by contacting the historical society at 631-757-9859 or visiting the museum at 215 Main St.


Historic homes of Orient and East Marion will be on display from noon to 4 p.m. at the Oysterponds Historical Society's annual holiday house tour. Check-in will take place at the Orient Congregational Church, 23045 Main Rd., where visitors will receive tickets, maps and home descriptions. Tickets are $25 in advance or $30 at the door. For details or to buy tickets, visit oysterpondshistoricalsociety.org or mail a check to Oysterponds Historical Society, P.O. Box 70, Orient 11957. All tickets will be held at the door of the church. Call 631-323-2480 for details.


A tour of the Goodale Estate in Flanders will feature 12 themed Christmas trees. Tours of the decorated home, at 186 Point Rd., will take place every hour from noon to 6 p.m., with the last tour beginning at 4:30 p.m. There will be lunch and cocktails, live music and holiday movies. The tour will support an annual shopping spree and a Christmas dinner for homeless children and their families. Admission is $50 for adults and $5 for children 12 and younger, and includes a free raffle entry. Reservations can be made by calling 631-727-7229, and they are required up to 15 minutes before arrival.


Members of the Bellport Garden Club will decorate a recently renovated 19th century home on the Great South Bay. Visitors will tour the 13-room home, with views of the Bellport Village Marina, from noon to 4 p.m. There will be complimentary refreshments and a holiday boutique. Tickets are $15 each, or two for $25, and will be sold in Bellport Village at It's Only Natural, 118 South Country Rd.; Old Purchase Properties, 126 South Country Rd.; Eileen Green Realty, 153 South Country Rd.; and The Bellport Restaurant, 150 South Country Rd. For more information, call 631-286-3891.


For those who miss the dinner, twilight tours of the Vanderbilt Mansion will take place from 7 to 9 p.m. Dec. 26 through 28. Admission is $10 for adults, $9 for students and seniors 62 and up, and $5 for children 12 and younger. Hot chocolate and cookies included. Call 631-854-5579 for details.