The event has vanished

Rolled back to before the event started?

Maybe you logged out ?

You might have just logged out and forgot to log back in. Tap the picture on the lower left side to log in not anonymous on the right side which you probably did instead.

I always stay logged in.

Has anything else disapperaed, like your Giant redwood, has your Burns money mountain back to minimum, is your tap radius a 'blip'? You may have been affected by the roll back glitch. If so get EA to revert your game to previous period about 24 hours before the glitch happened.

uninstall and reinstall and be sure to not tap while it's downloading and it should do the trick if the glitch mentioned isn't on