Mini-events are special scenarios that take place in a given area for approximately 15-30 minutes a time. These events have "community goals", which means that anyone in the given zone works together to complete the scenario, and everyone who participated in the mini-event gets a reward upon completion. The gameplay during the mini-events differs depending on the task at hand, and the rewards range from badges to items.
The mini-events are randomized. This means that a random event will appear in a random zone at a random time. Also important to note is that except for Grucken Chuckin', the mini-events have CL caps to prevent people with high CL to spoil the scenario for people of lower CL.