I've set up a test event, but am having a couple problems.
When clicking on 'Attending' it takes me back to the home page. Then I have to go back to the page to see the section where it says 'you have not yet paid for this event'.
Clicking on the link to pay manually in the sidebar takes you to the homepage, and the link in the main page reveals the box, then the box disappears again instantly.
You can see the page here: