Sometimes you will see a temporary event showing up (e.g: Super Ball or Emergency at the Fair).

 

They will last 15 minutes and you need to stay in the game to play it and obtain the rewards properly. If you leave mid-event, you won't get the rewards correctly. 

 

You need to send your delivery workers in their scooters to cover the corresponding event by sending the food properly.  The faster you do it, the more prizes you will get! You can check how the event is going by tapping on the scooter button at the bottom right part of your game screen.

 

Don't forget to charge the Electric Booster machine by tapping on it to get a booster!

 

To have more chances to achieve more goals, you need to make the corresponding investigations at the magnifier button at the bottom right part of your game screen and hire more delivery workers by tapping on the scooter Parking.