From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
- May 5:
- The 22nd World Martial Arts Tournament begins.
- May 6:
- May 7:
- May 8:
- Cymbal is born and later killed by Yajirobe.
- Tambourine is killed by Goku.
- Piccolo Daimao defeats Goku, nearly killing him, in retaliation for the deaths of Cymbal and Tambourine. Goku recovers and begins his quest to find the Ultra Divine Water.
- Muten Roshi dies attempting the Evil Containment Wave.
- Chiaotzu is killed by Piccolo Daimao.
- Shenron is destroyed by Piccolo Daimao after granting his wish for restored youth.
- May 9:
- Goku drinks the Ultra Divine Water and survives its trials, becoming powerful enough to defeat Piccolo Daimao.
- Drum is born and later killed by Goku.
- Piano is killed during the second battle between Goku and Piccolo Daimao.
- Piccolo Daimao is killed by Goku.
- Piccolo Jr. is born.
- Everyone killed by Piccolo Daimao and his mutant Namekian sons are revived.