Hamlet defense was simply too long of an event.

From ffwiki

"There are two phases to Hamlet Defense: a 50-hour non-combat phase where Disciples of the Hand and Land can enhance hamlet readiness for battle, and a 25-hour combat phase where Disciples of War and Magic can join the local militia and fight beastmen directly, while Disciples of the Hand and Land can aid in the effort in other ways."

75h random events.