Free dining time this year is crazy! It is more packed than last year for certain meals (meaning character meals are very booked). Stuff will open up at 60 days, but it was a beast last year and so far this year is much tougher despite it looking like there were fewer overall rooms available for the promotion (and we always do deluxe dining so trust me when I say, it's really tough). You're going to have to be flexible and know things will open up and change once fastpasses are out. Things also open up when you're there, so you could get lucky, but don't count on it. There's more services you can pay to find dining now than ever.
If you see something open, grab it.
You might have to change a wanted Chef Mickey's to Cape May Cafe or Tusker. Or take an earlier time than you would like. CRT and BOG close early party nights so there's fewer of them open. You're also competing with people not on the dining plan who just want to make a reservation AND locals too. Good luck and pixie dust!