@Zahra, in my previous post here, I suggested 2 options to build the Docuss page name corresponding to a newly created event. You chose to implement my second (and simplest) option. However, I’m now realizing this option doesn’t work (I’ve edited my previous post to remove it). So you need to use option 1. Sorry for the confusion.
P.S.: from what I see in your code, you got the event id right.