It's hard to say exactly. It depends on the specific plot and events in the manga. Sometimes it could be during a celebration or after a successful raid.
It's not always straightforward. Sometimes an external benefactor or a sponsor might foot the bill if there's some underlying motive or deal. Or it could be that the pirates have saved up resources specifically for such feasts.
The story of 'A Feast for the Wolf in Heat' manga is quite unique. It involves a protagonist's journey in a challenging world, facing various obstacles. The themes include self-discovery, friendship, and the fight against adversity. The way these themes are explored keeps you engaged throughout.