Facebook Unremove Event How Do You UNremove Someone From A Facebook Event?

How do you UNremove someone from a facebook event? - facebook unremove event

After my friend told me a manager, I took my friend about this event as a joke, but do not invite them back. It is a secret group, and was the creator. I do not know why I had left, although he is the creator of the event. How can I re-invites to the event?

To clarify: I am not permanently excluded from the game, I clicked on the "x" next to his name and does not check the prohibition of "permanent" one.