Holiday caroling and shopping, Saturday and Sunday. Free.

There’s no shortage of ways to enjoy and participate in holiday caroling and find presents for the folks on your list (the good list, that is). For the singers or listeners, for instance, there’s Zombie Caroling (think “Hark, the Herald Zombies Sing” and “Deck the Halls with Skulls and Brains”) from noon to 4 p.m. Saturday at WholeTone Music Academy, 312 Highland Ave., not far from Porter and Davis squares in Somerville; Caroling on Union Square, traditional carols sung from 2 to 3 p.m. Saturday at Juliet, 257 Washington St., Somerville; Cthulhu Caroling, horror-themed parody carols from 7 to 10 p.m. Saturday in Harvard Square; and The 108th Annual Christmas Carol Services at 5 p.m. Sunday at Harvard Memorial Church, 1 Harvard Yard, Harvard Square.

For shoppers, the Harvard Square Holiday Fair’s first of three weekends runs from 10 a.m. to 6 p.m. Saturday and Sunday at 50 Church St., Harvard Square; the Cultural Survival Bazaar of indigenous artists is 10 a.m. to 5 p.m. Saturday and Sunday at Cambridge Rindge and Latin School, 459 Broadway, Mid-Cambridge; the Union Square Holiday Pop-Up Market is 10 a.m. to 6 p.m. Saturday and 10 a.m. to 5 p.m. Sunday at Warehouse XI, 11 Sanborn Court, Union Square, Somerville; the second Holiday Flea Vintage and Artisan Market is from 10 a.m. to 5 p.m. Sunday at The Center for Arts at the Armory, 191 Highland Ave., Somerville; the Rockin’ Holiday Flea Market and Bloody Mary Bash is from 11 a.m. to 5 p.m. Sunday at Once Lounge + Ballroom, 156 Highland Ave., Somerville (participants are asked to bring a small toiletry such as shampoo, razors or toothbrush to donate to Rosie’s Place, if they can); Art Party! (in which 30 percent of proceeds go to the local public school’s art department and the rest goes to the artists) from noon to 4 p.m. Sunday at Winter Hill Brewing, 328 Broadway, in the Winter Hill neighborhood of Somerville; and the Boston Hassle and Ignore Rock’n’Roll Heroes’ Black Market from noon to 6 p.m. Sunday at the Massasoit Elks Lodge, 55 Bishop Allen Drive, Central Square.

Eleventh Annual “Everyone Loves Latkes” and second annual Gingerbread Village visit starting at 1 to 2 p.m. Saturday on Brattle Plaza (in front of Brattle Florist at 31 Brattle St.), Harvard Square. Free.

Innovative versions of everyone’s favorite Hanukkah treat – a cousin of the hash brown – are served up free with creative condiments by Harvard Square eateries such as Grendel’s Den, The Red House and Hong Kong Restaurant. In addition, there will be fresh jelly doughnuts from Dunkin’ Donuts/Eliot Street Cafe and hot drinks from DavidsTea while Joe Kessler and his Klezmer band, Klezwoods, entertains with traditional songs of the season. Information is here. This is also the day the second annual Enchanting Gingerbread Village goes on display in the lobby of the nearby Charles Hotel, 1 Bennett St. Each gingerbread house was created by a Harvard Square business and will be raffled off at to go home with winners at the Dec. 21 end of the display.

Twelfth Annual Kendall Square Holiday on Ice World Dance Party from 11 a.m. to 9 p.m. Saturday at Community Ice Skating at Kendall Square, 300 Athenaeum St. Free.

Come eat and skate for free (though skate rentals are not free) while breaking for a 2 p.m. show with fast-paced, colorful performances of “a high-energy world dance party from the percussive rhythms of Polynesia to the Bollywood beats of India and on to the spicy sounds of Latin America” by local and international competitors and world-class professional skaters. Information is here.

Annual “Messiah” Sing with the Cambridge Community Chorus at 4 p.m. Saturday at St. Paul AME Church, 37 Bishop Allen Drive, in The Port neighborhood near Central Square. Free, but donations are welcome.

George Frideric Handel’s “Messiah” (a copy of the original score, shot by Billy Reed, is above) is the holiday classic Irving Berlin and Mariah Carey only wish they wrote. Come hear it or sing along (bring your own score, if possible) and enjoy a reception afterward with refreshments. Information is here.

Holiday Pops with the Cambridge Symphony Orchestra at 7 p.m. Saturday at The Center for Arts at the Armory, 191 Highland Ave., Somerville. Tickets are $20 general admission.

Expect seasonal favorites such as “Sleigh Ride” and “The Nutcracker,” classic Hanukkah and Christmas songs and an audience sing-along with the orchestra under the direction of Cynthia Wood, with guest artist Diana Jacklin (above) performing standards including “Over the Rainbow” and “Chestnuts Roasting on an Open Fire.” Student musicians from the Perkins School for the Blind (led by Perkins music director Arnie Harris) will join in, and St. Nicholas has also signed on a cameo. The Helping Hand Food Pantry benefits from canned goods donated at the show. Information is here.