What event?

[The Might]

I remember reading somewhere about a tale that Men would not listen to in full length...but I really can't recall where I read this...can anyone help ???

[Legate of Amon Lanc]

Mmm... I thought immediately of the tale of Beren and Lúthien, but I don't know if it is what you meant:
'I will tell you the tale of Tinúviel,' said Strider, 'in brief – for it is a long tale of which the end is not known; and there are none now, except Elrond, that remember it aright as it was told of old.
I can't think of anything else right now, but if I'll stumble upon something, I'll tell you.