Don't worry, other people know about the Sesquicentennial too. (After all, that pronunciation/spelling video has gotten 16,000 views and coverage on the Huffington Post.) Today's Poughkeepsie Journal has a long article on the event in which it explains Vassar's history, current statistics, and lists some Sesquicentennial events. The article quotes Cappy, Ed Pittman '82, and college historian Elizabeth Daniels '41, among others.
Update: Also a mention in Daily Freeman.
Update #2: WAMC radio spot here. Channel 6 here. Channel 3 here.