Public holidays
1511, Brasil, Piauí
| # | Date | Public holiday |
|---|---|---|
| 1 | Sunday, 1 January 1511 | Confraternização Universal |
| 2 | Tuesday, 7 February 1511 | Terça-feira de Carnaval |
| 3 | Friday, 24 March 1511 | Sexta Feira Santa ou Paixão de Cristo |
| 4 | Friday, 21 April 1511 | Tiradentes |
| 5 | Monday, 1 May 1511 | Dia do Trabalho |
| 6 | Thursday, 25 May 1511 | Corpus Christi |
| 7 | Thursday, 7 September 1511 | Independência do Brasil |
| 8 | Thursday, 12 October 1511 | Nossa Senhora Aparecida |
| 9 | Thursday, 19 October 1511 | Dia do Piauí |
| 10 | Thursday, 2 November 1511 | Finados |
| 11 | Wednesday, 15 November 1511 | Proclamação da República Brasileira |
| 12 | Monday, 25 December 1511 | Natal |