As described on Wikipedia, National Secretaries Week was created in 1952 through the work of Harry F. Klemfuss of Young & Rubicam, in conjunction with the National Secretaries Association, now known as the International Association of Administrative Professionals (IAAP). His goal was to encourage more people to consider careers in the secretarial/administrative support field. Using his skill and experience in public relations, Klemfuss promoted the values and importance of the job of administrative assistants. In doing so, he also created the holiday in recognition of the importance of administrative assistants.
The brand of leadership recognizing the partner relationship with a great secretary shows a direct relationship to productivity and professionalism, in my experience.
As I have had dialog with as many executive assistants as I have with executives, I experience the excellent customer service and respect for time and culture from the good ones. I have seen executives change companies in their career while negotiating secretary compensation as part of the move. The team is a package deal! Respect I admire!
Just like any other profession, there are good and great professionals in this field of choice. The great ones make a significant impact in the success of a team. Celebrate the people who make you look better and are the front line in experience for everyone who interacts with your company.