Just popping in to drop a theory!
I'm pretty sure that Dr. Facilier will be out for M&Gs for the party this year. I just found out that he was quietly out greeting guests in Epcot near the International Gateway last week (
source). In the past, it's generally been around this time that characters who would be out greeting guests during the party popped up once or twice in Epcot. In 2016, I met Jack Sparrow at the Gateway about a month before the first Halloween Party, and when I started walking towards France, Cruella De Vil was out. A day later, the Step Sisters were out in the same spot Cruella was! All of them were out for M&Gs at the party that year.
While he also appears in the castle show, and it's always possible they were just getting a new friend acquainted with him, Epcot is a common spot for rare or new characters to stop and say "hi" to guests before they appear at M&Gs. Notably, Kim Possible and Ron Stoppable were out in Epcot for a few hours last summer before they popped up again at a Moonlight Magic event that year.