How to celebrate Agnes' 100th birthday?

That's right, in my game this stunning woman will soon turn 100 years old! She won't be the first resident getting this old, but she will be the first I think that ought to be celebrated. She is still a major stockholder of Landgraab Industries, Inc. (making her one of the wealthiest residents of my kingdom), and she certainly left a solid (and perhaps aching) impression wherever she appeared. She currently resides with her cousin Agatha, in a cottage rented from the Rossie dukedom, with Agnes' son, daughter-in-law, and their little child who is Agnes' granddaughter, Agnella. Here is Agnes' family tree.

But, how would you celebrate Agnes Crumplebottom's first 100 years? Tea party? Finchwick festival? Dinner with the regional Duke of Rossie? A night in the theatre? A drink on the beach of Sulani?