I understand that for the 2004 Olympics in Athens, the whole of the VFR route structure for the Athens TMA was closed with the exception of one route allowing arrival and departure from the east, which was about 45 miles from the city. All VFR traffic was banned with the exception of those helicopters engaged in broadcasting or relaying for specific events and they had to carry a member of the security services as chaperone.
The Greeks deployed batteries of Patriot missiles at strategic locations to cater for the determined rogue aircraft.
I bumped into the crew of one S76 operating in and around Athens at the time and they were only able to achieve their tasking by operating full IFR, STARS and SIDs et al.
Looks like the beaches will be crowded with helicoppter pilots during the Olympics.