Located inside Brock's Thistle Complex, the Thistle Theatre, which has since been renamed the Sean O'Sullivan Theatre, features a thrust stage and steep rising tiers of seats in a semi circular 'bowl'. Although often described as a 550 seat theatre, in actuality it originally had exactly 543 seats. It is interesting to note that the official number of seats is now 538. The very first production to be held at the theatre was Lysistrata, the Greek comedy by Aristophanes, on July 29, 1969. Since it's opening in 1969, it has been the centre of a great many cultural events and other performances ranging from concerts and plays to lectures and speeches.