What is your nation's 4th of July holiday equivalent?

[Inner Planets]

Empire Day (3rd Nov.) which celebrates the UK successfully conquering Earth

[Simengland]

The Reigning Monarchs Official Birthday which is on the second Saturday of June each year.

[Hanovereich]

Three national days considered to be important to our history:

-17 March 1835, when King Louis charged into the Prussian lines with 10,000 soldiers and decisively crushed them, giving Hanover its independence.
-18 August 1916, when the Germans, who had invaded the country, surrendered to the numerically and tactically superior Hanoverians.
-2 June 1919, when it was renamed Hanovereich to distinguish it from the HRE-era state.

[North Godentring]

2 holidays serve as the equivalent to the 4th of July
National Resistance Day - held on the 18th of March and commemorates the beginning of the Godentring Civil War, and the beginning of North Godentring Independence.
Armistice Day - Celebration held on September 15th, which commemorates the signing of the Godentring Armistice, officially ending the civil war between the two nations.

[Great Nortend]

Apart from the days of local patron saints, of which there are numerous, King’s Day is the main national patriotic holiday. It is always on the feast of Whitsun, and thus changes depending on the date of Easter. This day marks the descent of the Holy Ghost on the Twelve Disciples, and thus remembers also the calling down of the Holy Ghost upon the King’s person at the coronation, and by extension, asserts the divine right of the King to rule and reign. It is also the traditional day for the confirmation and the taking of the solemn oath of liegance for children, at the age of 14 or thereabouts. On Whitsun and the days following, especially Whit Monday which is a high holiday and to a lesser extent, Whit Tuesday, there are many festivities, such as parades, plays and processions, both in celebration of the religious feast, and in honour of the Sovereign, who is „by the grace of God”, King. A famous event is the Royal Tournament held at Hameford Castle where hundreds of competitors in full armour participate in bouts of jousting, as well as other martial equestrian sports.

[Valentine Z]

1st of January, 2000, begins the start of the Valentian Era.

The Valentians - now termed as survivors of the Nuclear War, as well as the future generations - got aboard their spaceships, all 400,000+ of them watching in unison as Valentijn was the last to leave Earth. With more reassurance and security in mind, he pressed the button, triggering the terraforming event of the Earth. The radiation casted away, not destroyed but reused for benevolence. The radiation acted as additional energy supply, significantly contributing to the terraforming process as Earth was torn apart on the surface and at least 10 km depth worth of underground. It was not just that Mother Nature was restored, but rather, the buildings were restored. It would be up to the Valentians on what they wanted to do with Earth as the ancestors for the future generations.

[Perikuresu]

M8 day, celebrated on May 8th, the day the Perikuresuan states federated, as well as day to celebrate the mateship of the Perikuresuan people

[Gosudartsvo Gachimuchi Rus]

On August 10, 2007, in NicoNico Douga, appeared the adult film Workout: Muscle Fantasies 3, co-directed by both Can-Am Productions and Matt Thomas Productions, created and directed by Matthew Moore, produced by Ron Sexton, and released in the same year. The film stars Billy Herrington, Danny Lee, Anthony Capriati, and Duncan Mills and was responsible for the creation of Gachimuchi Pants Wrestling. It is celebrated nationwide as Gachimuchi Day, and also as the capital's founding day (see Shinnipori article in the Gachimuchi2 Wiki).

[Dexterra]

The First of March

[Broader Confederate States]

February 22nd is generally the big political day here, though many people also celebrate November 1, due to that being the day that the South voted to leave the U.S... again.

[Davao and Mati]

It depends on each state and here are following:

March 10th: Valencia Day along with Valencian Culture Day(for Principality of Valencia only)
March 16th: Davao Day along with Dabawenyo Culture Day (for Kingdom of Davao only)
May 8th: Mati Day(for Kingdom of Mati only)
June 16th: Surigao Day(for Duchy of Surigao only)
June 17th: Butuan Day(for Principality of Butuan only)
Every third week of August: Kadayawan festival(for Kingdom of Davao only)

However in terms of significance and celebrations, the April 7th: Liberation from the Spanish Day is the near equivalent to the US 4th of July in East Mindanao

[Joija]

Lēdersdëg is on the 26th of July every year. It is a celebration of Joija becoming fully independent from the Netherlands (Joija used to be a constituent country of the Kingdom). It has been celebrated ever since 1942.

[Alinghi Federal-Democratic Republic]

The equivalent of 4th Juy is 25th May the anniversary of the Democratic Revolution Day when a referendum make the nation a republic again.

[Fratanica]

We celebrate August 13th as "Freedom Day", when the formerly authoritarian and impoverished regime under Prime Minister August Lapins came to its end with a combined military coup d'etat and political uprooting. We also celebrate September 6th as "Constitution Day", when a new federal constitution was approved via public referendum.

[Gandoor]

Founding Day, on 12 October, is considered our nation's equivalent to the 4th of July. Founding day celebrates the ratification of the Constitution of the Democratic Republic of Gandoor and the establishment of the modern Democratic Republic of 12 October 1904.

[Oruntar]

The Monarch's official birthday, March 5. Parades, flyovers, fireworks, parties, celebrations, mostly everything non-essential is closed.

[Nolo gap]

national cat day, which is on what would be the 27th of may on the euro-american calander.

this is well after the vernal equanox and before the summer solstice.
we put it this way because there are several calander options, no single one of which has been officially adopted.

(13 months of 28 days, 19 months of 19 days, and those are just based on the earth year.)

there is also first demonstration of self propulsion on rails, from which modern cameroi dates itself.
the problem here again is lack of universe consensus as to what day to hold it on.

then there was the first war that was prevented by people realizing that wars could damage the railways.

then there was last human day. but all dates before the ending of ecopocalypse are uncertain and speculative.

so we really, our holidays are pretty much the only ones we feel universally confident of, those being the equanoxes and solstices.
we do celebrate, as mentioned other things, but there is invariably a local option, as to when to celebrate anything other then those primal points of the year.

[Republica Federal de Catalunya]

17th January. As it was when the abjuration law was passed and signed by the courts. Deposing king Philip the III (IV of Castille) of all their rights over my nation.

[The Union of British North America]

May 23rd is Union Day, when the Terms of Union of the St. James' Plan went into effect and the 13 colonies were placed under a general government in 1768. The St. James' Plan was formulated at St. James' Palace, a royal residence, where a colonial delegation elected by the Philadelphia Congress and King George III's ministers negotiated a confederation of the 13 British colonies to better address defense matters, relations with other colonial powers and the Native Americans in America, and future colonial expansion. About a century later, the NAU was essentially made into the first autonomous Kingdom of the British Empire and a co-equal of Britain in overseeing imperial and international affairs. The Union Act 1867 formalized this new status.

[New Visayan Islands]

December 8th is the anniversary of the Visayan Declaration of Independence; it was on that day in 1987 that the Free Visayan Republic, the precursor to the Confederation of the New Visayan Islands, declared independence from an increasingly repressive antebellum Philippines.

[Escalia]

There are two of them :
Unification Day,the Escalian calendar has it at the 7th of Veturalia in Earth calendar terms would be October 17. It is the anniversary of the formal end of the wars of Unification and establishment of one government over all of Escalia.
Constitution Day. Escalian calendar: 16 of Laurentinia Regular calendar 21 April. It commemorates the official ratification of the constitution and the formation of the modern Escalian state and form of government.

[Pirusavia]

There are three major holidays that may be similar to 4th of July in Pirusavia:

Day of the Treaty (sometimes called Pirusavia Day), celebrated in 31 January - commemorates the first incarnation of united Pirusavia following the Sagren Treaty in 1676.

Victory in Pirusavia Day, celebrated in 8 May - commemorates the victory of Pirusavia against fascism in the WW2.

Republic Day, celebrated in 10 August - commemorates the Republican Revolution of 1905 which ended the centuries-old totalitarian monarchy.

[Sincluda]

September 27th is The Day of Reconciliation, in which the civil war between the Olde Nation ended and Sincluda was founded.

[Berhakonia]

There is none. According to tradition, native Berhakli recognize St. Michael as the protector of the Khosan peoples, and attribute patriotic undertones to the Feast of the Synaxis of the Archangels. Officially, the Synaxis is recognized as a state-mandated holiday, and, unofficially, the feast is commonly associated with Berhakli nationalism and anti-imperialist sentiment.

[Zeganas]

(different planet, different calendar) The date of Nudran 16th, the 177th and/or 178th day of the 320.58 day year in Zeganas is celebrated as United Republics Victory Day. Typically celebrated with music and parades and a military parade and airshow combo in the capital city of San Manasso but there have been calls to end the military parade tradition.