During the event, you may want to enable Guided Access Mode on your iPad to prevent your guests from accidentally getting into the configuration for the photo booth. This will also keep your guests out of your other applications like your mail, photo albums, and so on.
How to Restrict Guest Access
Open Settings on your iPad.
Scroll down and select Guided Access and turn on Guided Access.
Return to your home screen and launch Party People Pics. If necessary, navigate to an album that you've already set up.
Triple tap the Home button.
Draw a circle around the information button in the bottom right corner of the screen.
Tap Start in the upper right corner of the screen.
Enter a passcode that only you know.
Enter the passcode again.
When you want to unrestrict the iPad, simply triple tap the Home button again and enter the passcode.