After the Closing Ceremony, where will be open?

I wonder.  80,000 inside the stadium alone and we won't want to go home. Would be no problem in Paris. Does anyone have plans for later, either local to Olympic Park or in town, or will it all be locked down? Did anyone attend the opening night?
It is said that on the night of the 1966 World Cup Final, pubs stayed open as long as they wanted but experiences like New Year's Eve in town have been pretty grim.
Any ideas welcome...