Hold the tournament on a commercial airliner that repeatedly takes off and lands. Certainly if someone on board the plane was using an electronic device during take off or landing something terrible would happen ;)

The true danger exposed here is the ease in which terrorists could execute a "denial of service" attack upon law enforcement prior to real terrorist action. If people over react to stunts like this then you can assume they will waste equal number of resources on other such events. Hopefully they have a good system of prioritizing their responses so something like this would be ignored if more menacing threats arose.