I feel like an "all gold event challenges" speedrun would be challenging and Fun to watch, and also an unique speedrun

Are you talking about getting every gold medal in every event for every difficulty? If so, then we have that with gold% but its absolute hell to play.

What about all challenges? (Except time based and online)

Nah, the time based challenge are the only ones I have lol

I think it would be interesting since it would be a story mode and an all events speedrun at the same time