Why I can't access to "http://www.adobe.com/cfusion/event/index.cfm?event=set_registered&id=1808719&loc=en_us"?

All of the old webnar/event links have been changed. You now need to go this page:

Adobe - Online Events

Then click on the Learn More link for the even of interest, fill out the registraton form and the actual webinar link will be emailed to your account associated with your  AdobeID. [Another step for Marketing in obfuscating the user experience...]