Many works are dedicated to (= honouring) certain entities; a large subset of those are commemorating anniversary x of the entity’s ~beginning/end, and it would be nice having that info recorded; thus at relationship “[work] dedicated to [entity]”, add attributes:
1. “[n]th [year]” field for digits
2. “anniversary”/“in memory” (drop menu / tick box?)

work:
Ibert: Ouverture de fête
= Japanese imperial dynasty; 2600th anniversary of foundation

release: Complete Works of Watanabe Akeo and Japan Philharmonic Symphony Orchestra
= Japan Philharmonic Orchestra; 50th anniversary of foundation

Edit: +
https://musicbrainz.org/release/62ea1139-1139-4027-a334-1f96e2977ad6
John Taverner: Commemorating the 450th Anniversary of His Death

https://musicbrainz.org/release/40f52e0c-df31-4784-bd14-c204ef5a6432
William Byrd: Commemorating the 450th Anniversary of His Birth