Adding at least one software license on your account will give you access to the online and in-app settings on unlimited devices. 

You can check on your account's licenses from the license page and can manage them from the subscription page. Add on licenses are discounted over your base plan's rate!

For the purpose of "launching the booth" and running your event, a single software license will allow you to run one iPad at a time.

In order to run multiple events simultaneously, you will need to have as many licenses as devices that you expect to be in use concurrently.

Your license will be checked when you launch the booth. 

Learn how to switch your license to a new device here.

Simple Booth Classic (formerly Event Edition) is purchased through the App Store and is associated with your Apple ID.

Apple will allow you to use it on multiple devices at a time if they are all logged in with the same Apple ID, typically with a limit of 5-10 devices.

Learn more about managing associated devices on Apple's website.