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| YEAR | DATE | EVENT | HEAD OF STATE | PRIME MINISTER |
| 1975 | 2 december | Popular Democratic Republic | Prince Souphanouvong | Kaysone Phomvihan |
| 1991 | 15 august | Kaysone Phomvihan | Khamtai Siphandon | |
| 1992 | 25 november | Nouhak Phoumsavan | ||
| 1998 | 24 february | Khamtai Siphandon | Sisavath Keobounphanh | |
| 2001 | 27 march | Boungnang Vorachith | ||
| 2006 | 8 june | Choummaly Sayasone | Bouasone Bouphavanh | |
| 2010 | 23 december | Thongsing Thammavong | ||
| 2016 | 19 april | Boungnang Vorachith | Thongloun Sisoulith | |
| 2021 | 22 march | Thongloun Sisoulith | Phankham Viphavanh | |
| 2022 | 30 december | Sonexay Siphandone |