The Tau Station Wiki is currently building a Calendar that aims to begin a compilation of all official and community events and Tau-niversaries that happen every cycle.
With everyone's contribution, the Tau-niversaries might become a funny thing in the future. Please contribute and submit your Tau-niversary or any event.
If you don't recall your first in-game day, you can find your Tau-niversary on your character sheet by the completion date of your first University course. Even if that's an estimation, it would serve the purpose of having your own date in the calendar. In alternative you can also send your Born date that can be ajusted.