Times change and empires crumble, yet the Nathan’s Famous Hot Dog Eating Contest endures. It’s an unusual mix of thrill, camp and gluttony. Maybe it’s the real “beautiful game.” The Fourth of July staple returns Saturday for another go-around. Eternal valor is on the line, along with cash prizes and a sequined belt. There will be title defenses from Joey Chestnut and Miki Sudo, who are the Michael Jordan and Diana Taurasi of gorging sausages.