The first event is called "Realmgate Incursion" and it tells the story of how the otherwise peaceful (like, think medieval warfare instead of AoS heavy metal warfare) Vale of Efengie comes to be involved in the crazy inter-Realm conflicts of Age of Sigmar.
Back when we did out Fantasy campaigns, we used a map our FLGS owner created that was a tongue in cheek translation of the layout of the store. It had such hits as Mount Cola, the City of Register, the Twin Cities of Couch, and so forth. Since it's something we're all familiar with, the Vale of Efengie is basically an AoS-ized version of this. The Vale is a secluded region of the Realm of Life. It has idyllic rolling hills and a volcano that belches forth life-giving nectar (Mount Koula). The Vale was originally settled a few hundred years ago by pioneers from Azyrheim who travelled on a road that goes directly from Ghyran to Azyr called The Azyrspire (visible in a zoomed out version of this map). When their first city (New Azyrheim?) was destroyed by a trio of meteors and corrupted by Nurgle, they fled to the Vale and lost all ties with Azyrheim.
We're going to be using a variant of the School League battleplan, so it will be similar to the type of events they run at Warhammer World (the event packs and battleplans for which are conveniently available on their web page). Here's a draft of the battleplan if you're interested.