They haven't done for years, I know Springsteen was there in '88 but i'm pretty sure there's been none since (i might be wrong).
It's one of these old stadiums that are built smack bang in the middle of residential areas, it's chaos on matchdays so i don't know how they'd cope with the long queues associated with stadium gigs. Newer ones like Ricoh, Brittania Stadium etc have them laaaaaaaaarge car-parks which makes things easier.