Dear people coming to the conference,
I'm glad you want to come. BUT:
Why do I have to keep re-sending the same information to people who can't be bothered to click on a link (okay, in one case you then have to click on another link from that one, but I'm not the one who designed that page; I wasn't even consulted about its design) to find out what they need to know?
All you're getting is the original e-mail with the link. I refuse to look all this stuff up and type it out just so you can not read your e-mail.