As others have said, I think it's more likely you'll just see the rewards (Noctis's gear, FFXV music Orchestrion rolls and the Regalia mount) go up for sale on the Mogstation. Yes I know the rewards for both FFXI events (how many people remember we actually had two completely different FFXI-themed events in FFXIV?) haven't ended up there, but the FFXIII event items did. And given SE has pretty much kind of moved on from FFXV and it's tie-ins, I don't really see there being any incentive to SE to bring the event back into FFXIV and just stick the items on the Mogstation.

Really I'm just waiting for the promised FFVII-themed event, as episode 1 of the Remake is now out and the time is as good as any, although with the pandemic causing havoc and everything, it's not surprising there has been no news about that. (Okay I just want an Aeris Aerith outfit for my WHM ).