Q: Why is my calendar not updating in my iPad?

Marty Roberts wrote:

 

What do I do?

You might start by asking your question more precisely.  Your current question is like going to a doctor and saying "Help!  I'm sick!! What should I do?"

Writing an effective Apple Support Communities question

If you happen to be using an iCloud calendar (it would be nice to know if you were), this might assist you:

Get help using iCloud Contacts, Calendars, or Reminders - Apple Support