Caesars has evolved over 40 years, becoming a part of American culture and earning a place in the minds of millions worldwide.
When Caesars Palace opened in 1966, the vision was to offer every man a taste of the good life. Every man could live like a Caesar. Hence, there is no apostrophe.
Caesars is the only place, where spectacular things happen all the time. Any given year, any given week, any given moment, which is why Caesars is renowned to be, Routinely Spectacular.