Gentleman-

I'm sorry if I caused a little confusion by not being more specific. The two 240 volt, 50 amp. receptacles are going to used for large public address systems in the State Park for a July 4th celebration. General announcements will be made along with a simulcast of a local radio station. No stage performances etc. That is the only need for 240 volt, 50 amp receptacles.
As I mentioned previously, the remainder of the power needs will be served with 125 volt, 20 amp. receptacles, primarily for food vendors. They will be all GFCI protected.
Many of events like this will take place across our Country this year. I hope nobody is getting bored with this thread because I do think it is applicable and the questions are sensible.

Frank