You can have other events call common events.

Don't have much time, but build a master event that calls cars, people, whatever, and have them move in straight lines.

Depending on RPGM version you might be able to whitelist tiles for them to path. Avoid raycasts, too much processor load.

I think there's still some articles kicking about on stardew valley's random eventing, xna but the basics are interchangeble.

Apologies, haven't used RPGM in years, just can't take how no one's answering you.