I am a modder, I developed a dynamic wave generation system last year.

[Lirania]

I can see that being very funny in the Events,people would actually have to Scout the enemies for any serious Threats aswell and warn the team to perpare healing or a barrle.

Public could be a bit harder to get it to work but there is no harm in trying.

Hell maybe add different attack locations which are randomly rotated through. Where you maybe get some seconds to move over to the Area, just like in Orcs must die,if anyone knows that game.