How do I restrict or lock my iPad to only use the Greenhouse Events App?

When at an event - you'll want to make sure that the only app being used is the Greenhouse events app.

Apple refers to this as "Guided Access" - when you enable "Guided Access" for your iPad - the only app that will be available is the Events app. 

Set up "Guided Access"

Tap Settings > General > Accessibility > Guided Access to set up Guided Access. 

• Turn Guided Access on or off
• Set a passcode that controls the use of Guided Access and prevents someone from leaving an active session
• Set whether the device can go to sleep during a session
• Start a Guided Access session

Start a "Guided Access" session

1. Open the app you want to use.
2. Triple-click the Home button.
3. Adjust settings for the session, and then tap Start.
4. Control apps, screen sensitivity, and motion sensitivity

End a "Guided Access" session

If you're using Touch ID on your iOS device, you can use it to end a Guided Access session.

1. First, go to Settings > General > Accessibility > Guided Access > Passcode Settings and turn on Touch ID.
2. Now, when you're using Guided Access, you can end the session by following these steps:
   1. Press the Home button once.
   2. Use Touch ID.

If you're not using Touch ID on your device, follow these steps to end a Guided Access session:

1. Triple-click the Home button.
2. Enter the Guided Access passcode.

For more information you can view Apple's documentation here: 

Use Guided Access with iPhone, iPad, and iPod touch