Q: Help! I've deleted a calendar in iPad and need to get it back.  Is it possible and what do I do?

Greetings faithshoebury,

Thanks for the question. If I understand correctly, you had a calendar and deleted it. I would recommend that you read these articles, they may be helpful in troubleshooting your issue.

If you have a backup from iCloud you could restore from that backup. 

Restore your device from an iCloud or iTunes backup - Apple Support

Is the calendar on iCloud.com?

About backups in iCloud and iTunes - Apple Support

Thanks for using Apple Support Communities.
Take care