The London Olympic Committee should be praised for its recognition of one of the most basic common-sense elements of event presentation: Event energy, legitimacy and enthusiasm are enhanced with a packed house.
Furthermore, the tax is considered to be disproportionate as funds could alternatively be raised by other means of budget attribution without affecting a basic freedom of the Treaty and, in any event, because the scope of the tax would be unrelated to the risks to be covered by the tax revenue raised.
For more about what to do in the event of a zombie outbreak, the CDC has basic preparedness on their website here, and has a comic book on zombie preparedness here.