It has been declared by proclamation that every 25th of July shall be a national holiday called Unification Day.

The Proclamation:
A Proclamation
FOR the declaration of a national holiday to be known as Unification Day

WHEREAS, by an act of the Parliaments of the United Republics of Aquria-Catopolis, passed on the twenty-fifth day of July, two thousand and twenty-five, united and formed the country of Aquria-Catopolis;

AND WHEREAS it is in the interest of Aquria-Catopolis that that day be officially adopted as a national holiday;

AND WHEREAS such a holiday would commemorate and celebrate the creation of Aquria-Catopolis, the unification of Aquria and Catopolis, and the identities of Aquria and Catopolis:

WE, THEREFORE, have thought it fit to issue this our Official Proclamation, and we do ordain, declare, and command that on and after the sixth day of September, two thousand and twenty-five, the twenty-fifth day of July of every subsequent year shall be a national holiday called Unification Day.

You may also view it here:
https://scratch.mit.edu/projects/1214053322/