Expeditions are special extra events in temporary locations. They become available at level 7. All current expeditions and additional events can be found on the adventure map in the lower right corner of the screen.
Expeditions can be temporary or regular.
Temporary expeditions begin simultaneously for all players on a certain day, regardless of the player’s progress in the chapters on the adventure map. Temporary expeditions usually last 7 days, but can sometimes vary in length.
Regular expeditions unlock based on the player's progress in the chapters on the adventure map. They have no time limits. When you successfully complete a regular expedition, the expedition map closes after 24 hours and you can proceed to the next regular expedition. The completed expedition marker remains on the adventure map.