Hello betsyfromivins,
Thank you for using Apple Support Communities. We'd like to help you with your iPad not being able to connect to a specific Wi-Fi network. Let's follow the steps listed in this resource. You'll be able to further isolate and troubleshoot this issue: If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support
1.) Make sure that your router is on and that you're within range. If you're too far from your Wi-Fi router, you can't get a signal, so make sure that you're within range.
2.) Make sure that Wi-Fi is on and that you can see your network. Go to Settings > Wi-Fi and make sure that Wi-Fi is on. Tap the name of your Wi-Fi network to join. A blue checkmark beside a network name means that you're connected.
If you see Auto Join disabled under Settings > Wi-Fi > [Your Network], tap the More Info button and then tap Auto-Join.
3.) If asked, enter your Wi-Fi password. If asked, enter the password for your Wi-Fi network. Get help if you don't know your password. Even if you enter the correct password, you might see an "unable to join the network" message or an "incorrect password" message.
4.) Check for issues with your Wi-Fi network. If iOS or iPadOS detects an issue with your Wi-Fi connection, you might see a Wi-Fi recommendation under the name of the Wi-Fi network that you're connected to. For example, you might see the alert "No Internet Connection." To get more information, tap the Wi-Fi network.
5.) Restart your device: Restart your iPad - Apple Support
6.) Reset your network settings. Tap Settings > General > Transfer or Reset iPad > Reset > Reset Network Settings. This also resets Wi-Fi networks and passwords, cellular settings, and VPN and APN settings that you’ve used before. If you're using iCloud Keychain, these settings are also removed from other signed-in devices.
If the Theater Wi-Fi is a captive Wi-Fi, then follow the steps listed here: Use captive Wi-Fi networks on your iPhone or iPad - Apple Support
We hope this helps out. Thank you for using Apple Support Communities. Take care.