This San Diego Mexican restaurant will serve $3 tacos all day on Oct. 4.

The casual-dining chain, headquartered in Greenwood Village, Colo., will celebrate Taco Day with its new Taco Tavern Double – a taco-burger mashup – available for $6.99 now through Dec. 31. The menu item features two beef patties, melted pepper Jack cheese, crispy tortilla strips, guacamole, salsa and lettuce on a bun.

On Oct. 4, this taqueria in Washington, D.C., will serve up the chefs’ limited-edition Three Amigos Taco series – a fried green tomato taco, a blackened shrimp taco with pineapple-kiwi salsa and a steak and peppers taco. Santa Rosa will also have a mariachi band playing live music from 5 p.m. to 7 p.m.

Don Chido in San Diego will celebrate Taco Day with a special platter – which will include carne asada, rajas poblanas, shrimp, pollo, carnitas and fish tacos – priced at $10.40.

This Boston spot will offer al pastor tacos a la carte for $4 on Oct. 4.

This Los Angeles gastropub will party all day on Taco Day with beef and chicken tacos available at four for $10 and margaritas priced at $6 each. Guests who order four tacos with a margarita only get charged $15.

The Lake Forest, Calif.-based quick-service chain will celebrate Taco Day with a special deal on its new Queso Crunch Taco – a regular taco wrapped in a layer of creamy queso and a flour tortilla. Those who sign up online to join Del Taco’s e-membership program will receive a buy-one, get-one free coupon for the Queso Crunch Taco. Existing members will receive the coupon as well.

The Mexican restaurant in San Diego will offer its tacos at half-price on Oct. 4. To redeem the discount, diners just need to show their server that they follow Puesto on Instagram.

Headquartered in Portsmouth, N.H., Margaritas will challenge guests throughout the month of October with its $12.99 Taco Gigante, a 12-inch, two-pound taco filled with lettuce, refried beans, rice, ground beef, chicken, carnitas, cheese, salsa, bacon, queso, various sauces and pickled jalapeño peppers. Those who conquer the Taco Gigante will claim a spot on the Margaritas Wall of Fame and anyone who orders it will receive a voucher for another Taco Gigante to either try the challenge again or dare a friend.

Guests at Camacho’s Tacos in Manhattan can enjoy a free tequila shot for every taco they order on Taco Day.

The Blind Burro in San Diego will serve up fish tacos for $4.50 from 3-6 p.m. on Oct. 4. The tacos are made with Mahi Mahi, lime cream, green cabbage and carrot escabeche. Drink specials on margarita and beer will also be available during that time slot.

The Miami-based Mexican chain will give away one free original taco with any purchase now through Oct. 8 in honor of Taco Day.

This Chicago casual-dining spot will offer its new Taco Taco Salad for only $10 on Taco Day. The dish contains chopped romaine lettuce, tomato, queso, black beans and avocado tossed with salsa vinaigrette in a hard shell bowl with a chicken tinga taco on the side.

Taco Day means $6 beers, $7 house wine and sangria, $8 margaritas and three tacos for $7.50 at Campeon in New York City.

Owned and operated by Cypress, Calif.-based Real Mex Restaurants, these three brands will treat guests to a free taco when they come in and say “taco” on Oct. 4.

For Taco Day, Veladora at Rancho Valencia Resort & Spa in San Diego offers lobster tacos made with grilled lobster, shredded romaine lettuce, avocado, radish, guajillo pepper aioli, brown rice and black beans in corn tortillas.

Based in New York City, the fast-casual chain will give away a Dos Toros black card worth $100 in burritos and tacos via its Instagram account on Oct. 4.

The Kettering, Ohio-based chain will celebrate the special day with a buy-two, get-one free promotion. Guests who buy two tacos will get another one free on Taco Day.

BLT Steak in Miami offers steak tartare tacos with black garlic – a fancy version of the classic Mexican dish.

On The Border, headquartered in Irving, Texas, will honor the special day with unlimited 50-cent tacos on Oct. 4. The deal applies to the beef, chicken tinga and veggie mini-crispy tacos.

Diners in Miami can celebrate Taco Day sushi-style with this restaurant’s salmon tartare taquitos topped with avocado mousse, pico de gallo and masago roe.

Guests at fast-casual Mexican brand Pancheros, based in Coralville, Iowa, can enjoy Oct. 4 with their choice of marinated steak, slow-roasted pork carnitas, chili-tamarind chicken, marinated veggies or tofu in the restaurant’s freshly pressed, housemade tortillas.

Headquartered in Austin, Texas, Chuy’s has many festivities in store for Taco Day. Diners who visit the restaurant on the special day can add a crispy beef taco to any order for only $1, get $1 off on Mexican beers and buy any Chuy’s T-shirt featuring a taco for $10. Those who dress like a taco will earn a free entrée of their choice. Also, social media fans who check the brand’s pages for a secret catchphrase and repeat it to their server on Oct. 4 will enjoy a free crispy beef taco with their order.

Located in Venice, Calif., Surfside will serve Los Angeles-style street tacos for Taco Day. Customers can enjoy their choice of short rib, chicken or tofu and mushroom in housemade corn tortillas with a topping of cilantro and onions.

Seafood lovers can celebrate Taco Day with ceviche tacos flavored with pickled peppers, compressed pineapple and citrus at this restaurant located at the Ritz-Carlton in Fort Lauderdale, Fla.

The Mexican brand, headquartered in Rockville, Md., will offer a buy-one, get-one free deal on all of its street tacos on Oct. 4. There is a limit of five free tacos per person.

This restaurant at the Hilton Orlando in Florida offers Taco Day fans lobster tacos with pickled watermelon rind, jalapeño peppers, bacon Sriracha aïoli, sprouts and plantains.

Based in Irvine, Calif., the quick-service brand offered an exclusive Taco Day dinner at the Taco Bell Test Kitchen available to reserve via OpenTable. Attendees will enjoy a five-course menu on Oct. 4. For Taco Bell fans who didn’t get to score this special meal, there will be a box set featuring Nacho Cheese, Cool Ranch, Fiery Doritos Locos Tacos and Crunchy tacos in limited-edition wrappers available for purchase at participating restaurants for $5.

Guests at this Miami hotspot can rustle up their own tacos at the restaurant’s Make Your Own Taco section. This D.I.Y. bar will offer chuletón al pastor, or pork chop in adobo sauce with pineapple, cilantro and onions.

Headquartered in Irving, Texas, this fast-casual brand will give away a free crispy beef taco with any purchase on Oct. 4.

Located inside the Seminole Hard Rock Hotel & Casino Hollywood in Hollywood, Fla., this restaurant offers tacos made with Wagyu beef, cilantro, soy shallots and aji amarillo aioli.

Located in Lexington, Ky., The Village Idiot puts a local spin on the taco with its bourbon sesame-glazed chicken tacos featuring panko-crusted chicken strips, shaved carrots, radishes and sesame seeds.

Vegetarians can enjoy Taco Day too with the crispy coconut cauliflower tacos at this restaurant in Dundee, N.Y. This meatless version features cauliflower strips breaded with a mixture of coconut milk, lime juice, cornmeal, rice crisps and coconut flakes and paired with a purple carrot slaw.

Based in Fort Worth, Texas, Fuzzy’s will sell $1 tacos all day on Oct. 4.

Located in Kauai, Hawaii, Merriman’s Poipu reinvents the taco with local flavor. Its Kalua Pig Carnitas Taco features Kalua-style pork – cooked in an earthen oven in the ground – topped with house-made watercress kimchi, jalapeño peppers and roasted tomato salsa.

This Fort Lauderdale, Fla.-seafood spot inside the Riverside Hotel will offer grilled or blackened fish tacos and rock shrimp tacos on Taco Day. Both options will be served with flour tortillas, coleslaw, Sriracha mayo and pickled green tomato salsa.

Taco Day enthusiasts can stop by this Fort Worth, Texas, shop for its carne asada tacos made with the namesake beef marinated in chimichurri and garlic and topped with Chihuahua cheese, caramelized onions and cilantro.