[quote=@Expolar]
<Snipped quote by hatakekuro>

That's what I thought as well, but I'm having difficulty remembering where I found that information (Not feeling well at the moment and trying to do a bit of HW). Do you remember when this free day was shown or mentioned? 
[/quote]

Yeah, in the manga. 
http://fairytail.wikia.com/wiki/Grand_Magic_Games_arc
Look under Revelations of the Coming Tragedy.