Public holidays
1820, Japan, Banks
| # | Date | Public holiday |
|---|---|---|
| 1 | Saturday, 1 January 1820 | New Year's Day |
| 2 | Sunday, 2 January 1820 | January 2 |
| Monday, 3 January 1820 | New Year's Day (observance) | |
| Tuesday, 4 January 1820 | January 2 (observance) | |
| 3 | Monday, 10 January 1820 | Coming of Age Day |
| 4 | Friday, 11 February 1820 | Foundation Day |
| 5 | Monday, 20 March 1820 | Vernal Equinox Day |
| 6 | Saturday, 29 April 1820 | Shōwa Day |
| 7 | Wednesday, 3 May 1820 | Constitution Memorial Day |
| 8 | Thursday, 4 May 1820 | Greenery Day |
| 9 | Friday, 5 May 1820 | Children's Day |
| 10 | Monday, 17 July 1820 | Marine Day |
| 11 | Monday, 18 September 1820 | Respect-for-Aged Day |
| 12 | Saturday, 23 September 1820 | Autumnal Equinox Day |
| 13 | Monday, 9 October 1820 | Health and Sports Day |
| 14 | Friday, 3 November 1820 | Culture Day |
| 15 | Thursday, 23 November 1820 | Labor Thanksgiving Day |
| 16 | Saturday, 23 December 1820 | Emperor's Birthday |
| 17 | Sunday, 31 December 1820 | New Year's Eve |