As well as regular levels in town buildings, the game also features special events. Some of these run parallel to the main storyline in the town, while others can be directly connected to completing levels in buildings. The icons of active events are located on the left side of the screen. To start an event, all you have to do is tap on its icon.
Bear in mind that all events are time-limited. Once their time runs out, they disappear, regardless of how much progress you have made. A timer showing how much time is left until the event ends is displayed on the event's icon.