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This year, since it's the 100th anniversary, the entire population of Poland will sing the national anthem starting at exactly 11:11AM 11.11.2018.

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Since it is the capital, the most interesting stuff happens there. There's a giant military parade from all branches.
The president also makes a speech about various inane things, that are mostly loosely related to Poland.

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St. Martin's day is also
on 11.11, so the festivities go together. The most known thing here is the rogal marciński, which is a croissant with a white poppy filling.

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Some cities have their own ways of celebration, and some have overlapping other holidays.

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It is usually treated with utmost seriousness, celebrated nationwide. No different nowadays.
There's a lot of military parades. The one below is in Warsaw.

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Poland has regained its indenpendence on 11.11.1918 - exactly 100 years ago. Just as anyone would celebrate their 100th birthday, Poles are pretty joyful as well.
Józef Piłsudki (shown below) was responsible for it.