Campers and staffers dress up as Greeks (togas and beards), Romans (tunics, sceptors/swords and olive-branch crowns) or egyptians (anhk necklaces, cloth wraped around your waist like a skirt, posterboard crowns). Stage a three way game like ambush between the empires. Also, carry the camp director on a folding chair lashed to 2 long, thick dowels and declare him your king.
Go to historical or museum web sites to get ideas for the costumes.
Requirements
to get ideas for the costumes, go to historical or museum web sites