If you're the type that likes to book things way in advance, you may want to wait.
As has been discussed here often over the years, since moving to the WSCC in 2007 PAX has had pattern where it is on Labor Day weekend (the first Monday of September) except in 2007, 2011, and 2015. In all three cases, it was the weekend before. I forget exactly what the conflict is, but there's some other long-running event that uses the WSCC every four years.
Official confirmation of the date has been late in recent years, but we generally had a pretty good idea when it was going to be.
I'm intending this thread less as a speculation vehicle and as more of a heads up. We likely won't have confirmation of the date for a while.