I believe this is the event that starts it immediately is "Adventure 1: A helpful neighborhood werewolf" (Required: After seeing ‘The beginning of the end’ event)
And the required event for that as well requires Top Logan, which is also why I missed it I suppose, since my latest save is for the Bottom Logan.
Also some other requirements for 'The beginning of the end' event – While entering the barn (Req: Caleb like minimum 50, Lizards, Feliar, Korg invited to the fair, Walk with Caleb event done, Werewolf event concluded – the special fight added in the last update for Top Logan.