Yes, I think Hampden Park showed the way with the 2014 Commonwealth Games.
A temporary raised platform, covering the first x rows of seats should allow for a running track to fit inside the ground.
Hampden had the advantage of having more space around the pitch than we'd want, but if we're going for a 60,000 seater stadium, then even if we lost the bottom third of all four stands seats with the raised surface, it'd still have 40,000 seats. That's plenty for the Commonwealth Games - Hampden had 44,000 and Manchester's had 41,000.
Take it out when the games are done and everybody's happy.
Hampden park is hated by football fans though isn't it ?