I know in DL the Christmas Parade starts mid-November, and happens all through Thanksgiving Week. I would guess that the WDW schedule is very similar. Anyone have any inside knowledge that would know for sure? I know the ship will already be decorated for Christmas during our cruise (and by at least our 2nd stop at CC, it too should be decorated for Christmas).
As to Jackie's question, most of the CA schools are out for the summer by the first weekend in June (others by the 2nd weekend). Those schools that operate on a year-round schedule are not out for the summer until the last Friday in June. So... May in DL is good (just not over Memorial Day weekend)!