If the dates have been released for booking you can schedule Pirates and Pals at 180 days like the rest of your ADRs. However, for some reason they don't always have the dates available that far in advance. I'm visiting in April and we are doing Pirates and Pals. When I tried to book at our 180 day mark in October, they said the dates hadn't been released and to call back. I called back once or twice every week and wasn't finally able to book until sometime around Christmas. So, I'd try at your 180 day mark, but don't be surprised if they tell you you have to keep checking back.
As for the PP who asked about booking BBB, for the 4th day of their trip at the 180 day mark, you should be able to do that. I booked DDs BBB appointment for day 3 of our upcoming trip at the 180 day mark.