History of the Hollywood Casino Amphitheatreįirst opened in 1990, the Hollywood Casino Amphitheatre was originally known as the World Music Theatre for the first few years of its existence. Known far and wide for attracting the biggest and most popular names in music for decades, any concert at this venue is an affair to remember! With a capacity of more than 28,000 seats, the Hollywood Casino Amphitheatre, located in Tinley Park, is one of the biggest outdoor entertainment venues in the Chicago area.