I've created a Facebook event for a silent auction, and I'd like for people without a Facebook account to be able to see the posts in the discussion area. But when I send them a link to the event page, there is no option for them to join the event or view the discussion. Other events I've seen have a "Join Event" button (see below) that allows people to see the discussion when they join. That button is missing from my event. What am I doing wrong?