I have just published a knightly feast scenario which might be helpful as a template:
If you want general advice on running a Feast, check out the Alexandrian's website ( by Justin Alexander), I found it to be good advice (and I cited it in my reference section).
On the whole you will need 5 to 10 important NPCs, probably 2/3 of which being magi*, and the rest being important non mage NOCs that can act as plot hooks/quest givers in the early years to propel into action.
Split the Feast into 3-5 locations that they can oscillate between, split the important NPCs between those zones, and have Feast “turns” where things change, and a few “random events” happen. Think of what interactions the NPCs might have with the other ones at the location in the same “turn” (in my feast it was a multi day affair so the turns were morning, afternoon and meal, and Night when relevant), and how the PCs might be hooked into action.
Consider what hooks you want for the feast based on PC flaws (the meddler Jerbiton comes across a dispute between two important mundanes from the Covenant and needs to pick sides fast or spend a lot of time solving the problem) and what hooks for later on you want to introduce (local Bishop/Count hates mages/has let standards slip/is in a land squabble… the faeries are spilling out from the woods and stealing children like they did 2 generations ago until a great hero brat them back and one of the important mundane NPCs relays this information to the PC as foreshadowing).
Plan then a closing event for the Feast to leave on a bang and you are set.
*: regarding the magi, having lots of heavy hitters risks making the PCs spectators.
The mirroring idea is a good one, showing them what they could be/become in an almost carricatural way is a nice narrative device.