I've heard of them being "High Tea" with ladies wearing hats and little girls wearing their best dresses (if they even have them nowadays!) and everyone on their best behavior. Pictures being taken and sold of the attendees, gift certificates to the library's used book store, cookies, gingerbread and other goodies sold.
Every member can bring their own tea pots and cups, if any. Our women's club has this every few years, and it is a hit, but a lot of work. Fancy table cloths, linen napkins, High Tea with no airfare to England!! Lovely (SOFT) music in the background.