I had asked Austin "How fix is the date for FTFF17 (July 13-16, right)?". He replied with "At the moment, there is no foreseeable risk of that moving. Once we officially update the website (soon) that means the date is locked.".
So unless the website has not been updated, that date can still move - even if it's unlikely. Last year a lot of people had problems because they booked their vacation too soon and the date got moved. That's why I don't officially mention the date yet