University of Silesia in Katowice

In Poland we have a number of public holidays of different origins. Majority of them have a set dates:

• 1^st of January – New Year’s Day
• 6^th of January – Three Kings’ Day
• 1^st of May – Labour Day
• 3^rd of May Constitution Day
• 15^th of August – Assumption Day
• 1^st of November – All Saints Day
• 11^th of November Independence Day
• 24^th -26^th of December Christmas

However some of the bank holidays change their date depending on the year:

• Easter (Easter Sunday and Easter Monday)
• Corpus Christi (60 days after Easter, always celebrated on Thursday)

You can check the exact dates in a given year here: https://publicholidays.pl/