Well, the Orange County Register has helped me out with some new information....
This information makes it crystal clear, that Disneyland's Birthday is on July 18th!, and that in 1965, Disney did have a "Re-Dedication" day on a Saturday (July 17th), but it looks like that was done since they were premiering a new Summer Parade and wanted to have it start on Saturday instead of Sunday....
July 17, 1955: Grand opening of Disneyland. July 18 is the grand opening for the general public.
July 18, 1960: Disneyland celebrates its 5th Birthday on July 18 with a 5-foot-tall Birthday Cake.
July 17, 1965: Disneyland presents the “Tencennial Re-Dedication Day” featuring the “Disneyland Tencennial Celebration Parade.”
Well, hope to see some of you at Noon today for a celebration of the "Re-Dedication", and then at 4 PM for Flag Retreat and the "Re-Dedication" ceremony.
And of course, tomorrow, Friday, July 18th at Noon at the Hub in celebration of Disneyland's 53'rd official Birthday!