Public holidays
1820, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Saturday, 1 January 1820 | New Year's Day |
| 2 | Tuesday, 15 February 1820 | Carnival Tuesday |
| 3 | Friday, 31 March 1820 | Good Friday |
| 4 | Friday, 21 April 1820 | Tiradentes Day |
| 5 | Monday, 1 May 1820 | Labour Day |
| 6 | Thursday, 1 June 1820 | Corpus Christi |
| 7 | Thursday, 7 September 1820 | Independence Day |
| 8 | Thursday, 12 October 1820 | Our Lady of Aparecida |
| 9 | Thursday, 19 October 1820 | Piauí Day |
| 10 | Thursday, 2 November 1820 | All Souls' Day |
| 11 | Wednesday, 15 November 1820 | Republic Proclamation Day |
| 12 | Friday, 8 December 1820 | Immaculate Conception |
| 13 | Monday, 25 December 1820 | Christmas Day |