For a while I had struggled to find a way of displaying who had actually registered for the event, without actually going into the particular campaign.
However after much experimentation with the advanced find, a solution is with us!
What you need to do is:
Create an advanced find on Contacts with the following criteria
Activity Parties (Party)
Activity (Campaign Response)
Response Code Equals Registered
Campaign Equals "your event name"
all you then need to do is setup one for each campaign!