I think I just have to reset...

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EDIT: yep. Reset and followed the same steps and it worked fine. Seems like there's a bug if you complete the summer event first.
The chickens have never escaped.
I think I broke up by playing the beach adventure thing first and completing the third chicken event there, before every doing any of the other chicken events on the main story.
I would guess because the third one is complete, it cannot start the firsthand second, maybe? If so, that seems like a bug.
My stats are maxed. Almost every other character is complete.
Yep, aunt is complete.