The audience in Balthazar Beauregard's Big Top Bonanza determines the score players receive while participating in the circus. During your performance, the audience will react either positively or negatively on whether they like your actions or not. Doing standard emotes and performing the audiences' requests will earn more points.
If players mimic the clothes the nearby audience is wearing, they will obtain a better score.
The circus audience now appear as gnomes, when it is located near the Tree Gnome Stronghold.