The anniversary of the founding of a city, a state, a country, or any other geographic region (whether it be real or fictional), is often a cause for celebration. These are even more festive when the anniversary is a centennial (100-year), bicentennial (200-year), etc.
Truth in Television, as founding celebrations often take place in real life, with possibly the most famous one being Independence Day (July 4) in the United States (with its 1976 Bicentennial being more of a celebration than usual).
May be a Fictional Holiday.
- The Big O: "Heaven's Day" is a celebration of the day Paradigm City was founded. It's clearly related to Christmas (giving presents, trees, etc.), and Alex Rosewater seems to know the significance of its trappings, and mentions it's "the day God's son was born" - which has some ominous overtones given his ambitions...
- A Certain Magical Index: Academy City's independence day is October 9th.
- After Eden is about six characters whose love lives are changed in an unnamed city who is celebrating its centennial townfest.
- DC Comics
- Comics cover-dated July 1976 featured a banner at the top saying "DC Comics Salutes the Bicentennial".
- One of DC's infamous cash grabs was a tie-in comic titled Superman Salutes the Bicentennial, where Superman only appears briefly to introduce reprints of stories about DC's Revolutionary War hero Tomahawk.
- Unlike the DC example above, Marvel Comics released the comic Captain America's Bicentennial Battles, featuring an all-new Captain America story written and drawn by Jack Kirby.
- Independence Day: The aliens invade the Earth shortly before the 4th of July. During his rousing speech, the US president encourages people to fight for their lives. He anticipates that if humans prevail and survive, the 4th of July will be a holiday for the whole Earth.
"Perhaps it's fate that today is the Fourth of July. And you will once again be fighting for our freedom. Not from tyranny, oppression or persecution. But from annihilation. We're fighting for our right to live. To exist. And should we win the day, the Fourth of July will no longer be known as an American holiday... but as the day when the world declared in one voice: We will not go quietly into the night! We will not vanish without a fight! We're going to live on! We're going to survive! Today, we celebrate our Independence Day!"
- Rocky (released in 1976 and taking place in Philadelphia, where the Declaration of Independence was signed 200 years earlier) referenced the Bicentennial during the film. In particular, Apollo Creed dresses as both George Washington and Uncle Sam during his entrance to the boxing match.
- Josef Capek's children's book All About Doggie and Pussycat has a chapter "How Doggie and Pussycat celebrated the 28th October", which is about two anthropomorphic animals Doggie and Pussycat celebrating the foundation day of Czechoslovakia. They keep going shopping disguised as children because the shopkeeper promised to give a small Czechoslovak flag to all children for every purchase. They decorate their house with the flags and feel proud that it looks so pretty. Notably, the chapter about celebrating this democratic holiday was forbidden during both totalitarian regimes (Nazi's Protectorate and Communists).
- Randy Shilts' book about the AIDS crisis, And the Band Played On, begins with the Bicentennnial celebrations in New York City, when sailors from all over the world came there to celebrate, and addresses the speculation that the AIDS epidemic began with those sailors.
- Isaac Asimov's Foundation Trilogy:
- "The Encyclopedists": During the 50th anniversary of founding Terminus with the Encyclopedia Foundation, a hologram of the dead Hari Seldon appears and announces that the organization is a fraud, and Terminus was actually founded as the next Galactic Empire.
- "The Mayors": During the 75th anniversary of the Foundation colonizing Terminus, a hologram of the dead Hari Seldon appears, and describes the way the Foundation has used religion to subvert control from their more powerful neighbors.
- "The Mule": During the 300th anniversary of the Foundation colonizing Terminus, a hologram of the dead Hari Seldon appears, to describe the civil war between Terminus and the Traders... which had been called off due to the Mule's attack, causing a Mass "Oh, Crap!" reaction in every witness.
- The True Meaning of Smekday: The titular Smekday is an anniversary of when the Boov declared Earth a colony, renamed it "Smekland" (in honor of their glorious Captain Smek), and forced all Americans to relocate to Florida via rocketpod.
- All in the Family: In the episode "Mike's Move", after hearing a particularly racist rant from Archie on what makes America great, Mike says "I think we just heard Archie Bunker's Bicentennial Minute", a reference to TV spots that aired during the mid-70s.
- Firefly: The Pilot Episode opens on "Unification Day", a yearly celebration of the Alliance's conquest of the independent outer worlds. Captain Reynolds, having fought against Unification, likes to celebrate it by starting a Bar Brawl.
- Mama's Family: "Flounder's Day" centers on Mama wanting to sing Raytown's town anthem during its Founder's Day celebration.
- The Maude episode "Tuckahoe Bicentennial" has the title character organize a tribute to American women for the town's celebration of the Bicentennial.
- On Terra Nova, the colony has a yearly celebration commemorating the First Pilgrimage and the establishment of Terra Nova. It is called, appropriately enough, Founding Day.
- Sharp Objects: Wind Gap has Calhoon Day, celebrating a Confederate war hero and his underage wife, which is right on brand for the town's particular kind of ugliness.
- Starsky & Hutch: After a bribe attempt in "Bust Amboy," which aired in the fall of 1976, Starsky remarks, "You know, I think this is gonna be our first bicentennial bribery offer."
- The X song "Fourth of July" takes place on the titular holiday.
- Disney Theme Parks: From June 1975 through September 1976, both Disneyland and Walt Disney World presented America on Parade, a special pageant honoring American history and achievements in celebration of the Bicentennial.
- Homestar Runner: The "Happy Fireworks" toon is an episode focusing on the 4th of July (American Independence Day), although much like the site does for Christmas, the holiday isn't mentioned directly.
- Arthur: The episode "Elwood City Turns 100!" is about Mr. Ratburn's class putting on a tribute to their town's centennial.
- The Gravity Falls Season 1 episode "Irrational Treasure" has Dipper and Mabel attending Gravity Falls' Pioneer Day, which, while not specifically stated as the town's founding day, does put great emphasis on its founding by Nathaniel Northwest (or so it would seem. Turns out the town was actually founded by Quentin Trembly, the 8th and a half President of the United States).
- Mike, Lu & Og: The episode "Founder's Day" revolves around the islanders putting on a musical play about the founding of Albonquetine.
- In the Rocko's Modern Life episode "Floundering Fathers", attempts to organize a celebration for the anniversary of O-Town's founding lead Heffer, Filbert, and Mr. Bighead to debate over whose ancestors actually founded O-Town.
- The Simpsons: In the episode "Lisa the Iconoclast", Springfield prepares to celebrate its bicentennial when Lisa makes a shocking discovery about the town's founder. At the celebration, however, Lisa sees how the lie has brought out the best in everyone and decides to keep her discovery a secret. The episode also contains a reference to the United States' Bicentennial.
Principal Skinner: Now, as you all know, Springfield's 200th birthday is just a week away. Every class will do its part to make our local bicentennial just as memorable as our national bicentennial. Of course, you children are too young to remember that... with the possible exception of Kearney.Kearney: (shaving himself) Those tall ships really lifted the nation's spirits after Watergate.
- Star Wars Rebels: Empire Day celebrates the founding of the Galactic Empire fifteen years previously. Ironically, it's also Ezra's fifteenth birthday.