Seasonal events, when a new portal close to the Ardent Castle opens. These regions are only open during that particular season. Valentine Day, Twilight Vale, Equinox, Spooky Town, ..
Whatever level you are, it will be scaled up so even low level player can fight in the event zones.
All mobs in every event zone is atm level 79.
Back to: Regions
Sugarsweet Summit - (February)
Midsommer Eve Twilight Vale - (Early Summer)
Juni/Juli is the season for Midsummer's Eve, it lasts about 6 weeks.