Setup notification to registered users on update of an event

Hello,

First of all, it's indeed a very good module to use to enable user registration on events.

I need help in setting up an email notification to all the users that have registered for an event, on update of an event, for an example, the content type event is updated with whatsoever information. I request support/guidance on setting up this email notification because, users have registered with a particular event and, it will surely be useful for them to know whenever there is an update on the event like, documents added, photos/videos added, etc.

Also, please excuse me for keeping priority critical because, I need to deliver this notification option to my client so, requesting urgent guidance.

Thanks in advance