From Guild Wars 2 Wiki
Give Zommoros armor, weapons, trinkets, food, wood, planks, or metal ingots to receive a Captain's Council Commendation.
— In-game description
Discussed on the Talk:Captain's Council Commendation page.
- Donation Packages were planned to be sold only after the official start of the Lost Shores event, but due to a bug, were already available from Miyani before that time.