Accorhotels is having their 5th Anniversary of the Le Club loyalty program. Earn 5x points for staying in Accorhotels. Simply register for the offer, and book before 18 February for stays before 31 December 2014.
If you're a Platinum member, this will earn you 2.5x your usual Platinum earning rate.
Note that unlike an airline membership program, with Le Club the bonus points count towards your status qualification. So this will make it easier to retain your Platinum status.
Usually the earning rate is
Classic members get a 4% return
Silver members 6%
Gold members 7%
Platinum 8%
So 2.5x will get platinum members a 20% return.