Every event has a short event code. Anyone with it can open the booth on a device without signing in to your account.
Find it
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Open your event.
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On the Launchpad, look under Event access.
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Click Copy event code.
Note - The code is created when you first save the event.
Send it to someone
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Click Share code in the event header.
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Enter their Email address.
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Click Send.
You will see "Event code sent to …". They receive the code and can open the booth with it.
Tip - Use Share code rather than copying it into your own email. It is quicker and you cannot mistype the code.

The event code, on the Launchpad.
Important - Anyone with the code can open your booth. Send it only to the staff running the event.