Queen Jean, I'm going to say this promotion is ongoing since Harrah's and Harvey's Tahoe have had it for a long time (but no guarantee it won't get pulled at any time).
Still on their websites -
https://www.caesars.com/harrahs-tahoe/casino/Silver_Circle#.WQZtKfnysr8
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From: queenofcomps - Do they still have senior days on Mondays, with multiple-points and a free buffet???