I completed the first event only so far, but I only started playing Fury this evening, and most of that was spent in Zone and Speed Lap racebox races. Oh well, at least the first event has Elite gold medal in all cells already. Detonator and Zone Battle modes will be quite a grind to do later on, I suspect, the rest only require a bit of luck and the gradual learning of the new tracks.
I'm amazed at the number of events, though, I expected the Fury campaign to be like 30-40 races altogether. But I'm not complaining, at least it'll keep me busy for longer.