I had no clue what this was either, but a quick Google search led to a Casual Stroll to Mordor article that talked about it. Apparently it was a single day sale where one item was on sale for 50% off. Sounds cool and it would be awesome if it made a comeback, though I will not hold my breath.
Freeps:Taredhelion(63,Guard) ; Turmanarmo(32,RK) ; Rawlings(22,Burg) ; Drengi(29,Champ) ; More that will be leveled later
Creeps: None of note ... yet.
I missed the Quest Pack Sales. They had a vote on one, once, ages ago, and it was I think 70% off. I, of course, missed it because I was VIP at the time. Because of that, I went premium and never went back. Of course, they haven't had a neat sale like that since, and I've also managed to get all the quest packs over this time anyway.
Still, a one item 50% off would be great. Today's sale you can get stuff 30% off, but I haven't found a way to get what I want that way. I want several items for several of my characters, but I can't buy them all at once to get the 30% off. Oh, well.