I just saw a poster at the next office's door announcing the

• 95th Annual Meeting of the International Association of Applied Mathematics and Mechanics.

Here is another example of a meeting I will organize myself next year:

• The 94th Séminaire Lotharingien de Combinatoire

This brought me back to the following question that I was wondering about:

What are examples of long running and consecutively numbered international mathematics meetings?

Is there, for example, a (regularly and international) series that already passed its 100th instance?