It is a confirmed thing, but you won't know which characters are there until the day of.
So there will be two surprise characters each day at the mk flagpole. It's yet to be seen if there might be a weekly repeating pattern as this hasn't been happening that long.
well, it is like day 3 of the festival so makes sense
You'd think at this point they would have a better idea of what people want vs don't want but seems like they still run out of some things super fast and others they have way too much of