Foundation Day of Rome (Natale di Roma) - April 21, a civil holiday that is not a public holiday. But this is a very interesting and colorful festival. On the birthday of Rome, the gates of the city are symbolically opened so that both the inhabitants of Rome and numerous tourists from literally all over the world can enter them.
But in 2021, due to the coronavirus pandemic, celebrations may be canceled.
Rome was founded by Romulus on May 11 (April 21), 753 BC.