You can't actually do this. If too few nations send delegates, the event is cancelled. Happened to me once.How to win:
Conquer all helenic countries. Leave olympus as a vassal.
Be the sole conpetitior every time...
#winning.
Seriously though, yeah, olympics-events are repetitive and flat. There’s quite some stuff in their event chains to build on though i think, given how it makes characters move around and whatnot.
... like, after the inclusion of espionage, if I were host of olympics in a multiplayer game, I’d be wary of spies coming in at the same time.