Any events commemorating silver pieces?

Does anyone know of any traditions of commemorating events with silver pieces?

I’ve been going through a pile of mismatched silver pieces, given to me by various relatives.

These spoons are all engraved on the fronts with “Entre Nous” (between us). Then, most of the spoons have a date engraved on the backs — 1924, 28, 29, 31, 32, 34 (all different dates/months). Two are undated.

(The pattern is Gorham Etruscan Key.)