Very fun concept here for groups that enjoy a party following a victory, and the Strange Guests table is a treat!
Given the great effort put into it, feels like the heroes should earn a renown for the construction of the hall or some other reward. Additionally, I can see reasoning for hosting a feast being a typical project, but there is some mechanical strangeness in heroes being able to start the goal immediately after a big encounter to get the bonus to the roll and pausing that effort to pick up and finish later. Since there's usually some narrative immediacy and continued effort to getting a feast going, feels like something that might be better executed with mechanics akin to the fishing project to see how well the feast goes and if any crazy events happen with strange guests?
But, that's more of a gut feeling than anything else. This has interesting material to work with that functions well as is with only minor director adjustments. A fine submission.