Public holidays
1820, Poland, National public holidays
| # | Date | Public holiday |
|---|---|---|
| 1 | Saturday, 1 January 1820 | New Year's Day |
| 2 | Thursday, 6 January 1820 | Epiphany |
| 3 | Sunday, 2 April 1820 | Easter Sunday |
| 4 | Monday, 3 April 1820 | Easter Monday |
| 5 | Monday, 1 May 1820 | Labour Day |
| 6 | Wednesday, 3 May 1820 | Constitution Day |
| 7 | Sunday, 21 May 1820 | Pentecost Sunday |
| 8 | Thursday, 1 June 1820 | Corpus Christi |
| 9 | Tuesday, 15 August 1820 | Assumption of Mary |
| 10 | Wednesday, 1 November 1820 | All Saints' Day |
| 11 | Saturday, 11 November 1820 | Independence Day |
| 12 | Monday, 25 December 1820 | Christmas Day |
| 13 | Tuesday, 26 December 1820 | Boxing Day |