I would think they could easily do a kind of overarching feel kind of providing a "canopy" if you will over the event (figurative not literal) without making it so that there can't be individual scarezones.
I mean if you think of woods in horror films there are always "clearings" in woods that produce cemetaries, or cult alters, cemeteries, monster dens, worn down buildings or backwoods homes, haunted fields, hidden labs or bunkers... the list goes on. I can easily see the woods (if this is what is going to happen) "covering" the entire event with "clearings" being scarezones, which will fit the theme.