You can register for an event, you get a notice/warning that you've already registered, but you can still click "next" and continue to register and pay again and end up registered twice... shouldn't allow that, it's a problem and needs to be fixed.
Here is how to replicate this problem as I also replicated it on the DEMO site.
If a user is logged into the site, you can register for an event more than once (public or private events)
If you are NOT logged into the site, then of course the only events you can register for are Public, and in this case, it won't let you register twice.
I created an event, set for Public, registered for the event, then tried again, won't let me.
I logged into the site as a user, then registered for the event, then tried again, let's me register more than once.
I changed the event to Private, logged into the site (since you can't register for a private event if you are not logged in) then registered for the event, then tried again, let's me register more than once.
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