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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1940 | 5 august | 14° Socialist Republic of USSR | Augusts Kirhensteins | Vilis Lacis |
| 1941 | 23 june | German Occupation | ||
| 1944 | 13 october | 14° Socialist Republic of USSR | Augusts Kirhensteins | Vilis Lacis |
| 1952 | 10 april | Karlis Ozolins |
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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1953 | 17 january | |||
| 1959 | 27 november | Janis Kalnberzins | Janis Peive | |
| 1962 | 23 april | Vitalijs Rubenis | ||
| 1970 | 5 may | Vitalijs Rubenis | Jurijs Rubenis | |
| 1974 | 20 august | Peteris Strautmanis | ||
| 1974 | 20 august | Peteris Strautmanis | ||
| 1985 | 22 june | Janis Vagris | ||
| 1988 | 6 october | Anatolijs Gorbunovs | Vilnis Edvins Bresis |
| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1990 | 4 may | Republic of USSR | Anatolijs Gorbunovs | Ivars Godmanis |