Granny Event is one of the most dreaded events. Many many many many many players hate it.
Events are supposed to increase the game’s activity, not the other way round!
Here’s an idea:-
If Granny Event is made as rare as Blacksmith, but when it happens, she opens her entire shop for you, and you get to buy ANY, and i mean, really, ANY uber item that exists in the game, I believe many players will love the event.