Failing which (I think Nissan had all the stadium last year) the Le Mans Tourist Office speak English and have loads of B&B places. Expect to pay a minimum of 50€ per night.
I also think Nissan had the stadium this year. Didn't see any advertising on the ACO website for 2015.
Isn't a motorhome an option ? Been doing that for more than 10 years now, and I wouldn't go to LM without one now.