Board Thread:Support Requests - Getting Technical/@comment-1409684-20141225181127

I was wondering if it were possible for an Admin to create a pop up message for their wiki only. I know its too late for today, but say I wanted a pop up to say "Merry Christmas" on my wiki just one time when somebody comes on the site. Also, for this to be temporary, say... one day only. This would only be for one wiki, not all wikis. Thanks! 