Lieven asks:
Is there a canon precedent for a phrase like "The day on which xy happened"? Like in "remember the day we first met". {maqIHbogh jaj} sounds wrong.
The only thing that came to my mind was from the Drinking song, but I think that one is not considered a best example, is it? {jaj qeylIS molor mIgh Hoghchu'qu'} "The day on which Khaless" killed evil Molor.
I don't think so. I did find three other unsatisfactory examples: wa' jaj 'etlh 'uchchoHlaH tlhIngan puqloD; jajvetlh loD nen moj The son of a Klingon is a man the day he can first hold a blade. TKW poH tuj bI'reS nungbogh wa' jaj qeylIS DIS chorghvatlh loSmaH jav qaStaHvIS. [ In the days [sic] that follow the summer solstice in the Year of Kahless 846. ('U'-MTK) chu'DI' maS 'ej qaStaHvIS ram nuHmeyDaj may'luchDaj nIv je yIr qeylIS On the night of the new moon Kahless gathered his weapons, And his finest suit of armor. (PB) -- Voragh