The safest Skyshow was in 2010 when there was a 'zero tolerance' approach, and only half the usual people turned up. The Police Commissioner hailed it as a success.
Since then they've taken a more sensible approach, including alcohol free zones. It's been pretty successful.
In a 60,000 seat stadium you can cater for everyone.
The Government / Police should just let the Stadium sell full strength booze, at least in parts, but take a hard line against them for selling beer to people who are clearly drunk, or against fans being drunken idiots.