For those of us who play the Sims 4, and have an Overwolf account linked for the many mods available for the game, here are some game events that could be marked: 1) player switches between manage worlds screen and goes into a specific household.
2) Player switches between live mode and buy/build modes.
3) Player has Sim travel to a community lot.
4) Sim participates in festival events (related to expansion packs).
5) Sim celebrates a holiday or birthday.
6) Sims make woohoo.
7) Death of a Sim or Sim's pet.
8) Sim attends a party outside their home.
9) Club get together event.