Mini-tournament "Time of Change"

1) How will you know what to look for? And are there any such "hidden" objects on the map at all?

Well, actually... it's a good idea to scout the map in the editor first, looking for practically all the objects... tents, pillars, huts, Pandoras, events - everything essential ;)))
Another question is that I'm encountering this phenomenon for the first time, and I didn't quite understand at first what these hidden objects were ;)

There are 3 ways to replace objects on the map. What are they? - I can't say, so as not to upset the organizer...

Maybe the organizer will write to me in PM =) ;)