Calendar?

MutationACE

So there no use for this button called Calender left to New posts.
Does anybody if there was ever a use of this in the past?

When clicking on it it says:

MutationACE, you do not have permission to access this page. This could be due to one of several reasons:

Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation.

one_9

I've seen it in action on this board... it's still a work in progress on how to get regular users involved.

Basically it's just another feature by vBulletin that's currently inaccessible to regular users.