Some of the PR hype around the 50th anniversary is to make it SEEM like there is big demand. Most times we have gone in the past, they were always celebrating something. Marketing does that to generate interest, nothing wrong with that but doubt that alone would have a large impact on openings. Many are still cautious about covid, so likely they wait until the 30 day window to cancel an existing reservation without penalty. I believe some construction is going on at certain Disney properties and/or all have not yet reopened to full occupancy which can impact availability.