I would suggest a couple things:
- A next idle unit/next unanswered event button. This could be hotkeyed to 'n' or '>' etc. (it could even be the default action of the "next turn" key, and the game would prevent you from going to the next turn without going through your events/units first--this could be turned off in settings), and upon pushing it the game would center upon the next unit that isn't doing anything, like a champion you sent out exploring who reached the destination you sent him to, or it would take you to a city that has an "unanswered event" this could be a construction queue ending. Units could have a "Guard" or "Sentry" or "Idle" action which would make them exempt from being selected when pushing "next idle unit" so you aren't constantly going through units that you are intentionally leaving in one spot doing nothing.
- Make the current events standout more. Possibly make them flicker or flash if they have been unanswered. This could optional, and could be turned off in settings.
I don't mind the audio warnings, but it would be nice to have visual warnings too. Often times I play without sound, or with loud music.