Just had a quick look at the Club Carlson 2for1 rates (reserved for CC gold members, you should be able to get a match with your Accor Platinium), and there is availability for one hotel at CDG airport (Park Inn Paris By Radisson Charles de Gaulle Airport) for 150€ between the 21st and the 23rd (2nd night free). It might not be the best place in the world, but it is about 30 minutes by RER to Le bourget. Looking at the reviews quickly, I see this "we are fully aware of the refurbishment needs and that a full renovation is planned during the low season in 2013", you might want to send them an e-mail before and ask them if this will be done before your stay, otherwise quite a few people are complaining about the place being old and worn out.

They offer a (free?) shuttle to the airport too, that you will need to take to get to the RER station.

On this rate and the other similar one (4for2) it is all that they have in the Paris area that weekend.