I remember that, and I had read about it on somebody's Trip Report before we went. Did ours at Paris, and I looked for it since I knew about it from the TR. Had an excellent free breakfast buffet.
This seems to be the type of promo that you 1) find out via a sign or something in the casino after you get there, or 2) word of mouth or TR. LVA posts it in daily news if they find out about it. I get tons of snail mail from all the casinos in Mississippi (Tunica and the coast) and they include all those promos, buffets, rooms, Free Play, etc. But Vegas, even when CET sends those mailers out for the Mississippi casinos and advertise the buffet promos, they don't much for the Vegas CETs, at least they don't come my way.
The other thing is that IF they (Vegas CETs) happen to send something in e-mail or snail mail, if I'm not planning a trip during the dates of the promotion, I toss it.
Again, LVA Trip Reports often tip us off to the buffet and other promos in Vegas.
When you go, stop at the Total Rewards desk (every casino you go to) and ask about promotions. They don't all have the same promos, either, because they all have different restaurants, buffets, other eateries. Paris has so many eateries, good place to start.