I had a speaker come and do a keynote address on etiquette to my chapter when I was Membership Ed. It went over very well.
The lady who spoke was a teacher, and taught a 1 credit hour course on etiquette which I was taking as an elective that semester. (I went to school in the South...)
If your school has a restaurant and hotel management degree, or something like it, I would start there. They probably have a teacher who would be happy to speak with your chapter.
BTW, if you like Emily Post you may want to try Letetia Baldridge's guide to Executive Etiquette. It talks all about etiquette in the business environment. Definitely good reading for any graduating senior
