Fan Title Event

I saw someone talking about this activity in a book review, and I searched for a long time before I figured it out...

Then, to start this event, just find it in the starting app, find the event center, find the fan title event, and enter the author's name to join.

I don’t know exactly what it’s useful for, I just got this after seeing someone mention it in the book review area...

What should be the name of the event?