In PRL (Polish People's Republic) times, the date was moved to 22 July to honour the day the PKWN Manifesto (a document that basically asserted communist authority over Poland) was issued in 1944. In 1989 after communism fell, the holiday was restored to its original 11 November date. To mark the occasion every year in front of the Tomb of the Unknown Soldier on Pl. Piłsudskiego in Warsaw there’s the official Changing of the Guard with all the big wigs, president, prime minister and top brass in attendance. Outside of the capital, cities all over the country hold their own parades as well.
Due to the ongoing COVID-19 pandemic, 2020's ceremonies will be heavily curtailed to prevent crowds gathering! Regardless of what happens, you can bet your bottom dollar that there will be a lot of people from all political spectrums celebrating, waving flags and setting off flares on Poland's Independence Day!