June 24 was day that New Orleans Square opened at Disneyland in 1966. Previously, Holidayland occupied the space (1957 to 1961). The area features two of the most popular Disneyland, Haunted Mansion and Pirates of the Caribbean.
On that day, Walt Disney made the then-mayor of New Orleans, Victor H. Schiro, mayor of New Orleans Square.
Here is some footage of that day. As noted in the comments of the video from Disney, it is bittersweet in that this is one of the last times Walt appeared on film enjoying his park.