Charlie Chaplin goes to the theatre, obviously mayhem ensues. Firstly he has trouble getting a seat he likes, and of course causes a lot of disruption changing it. Finally he gets into a fight with the conductor and is thrown out!
Meanwhile in the cheap seats is a tramp, who looks rather like Chaplin's future iconic character, who causes even more trouble. When a fire eater is on stage he thinks the building is on fire and starts to hose down the stage... and the audience!
The film is of it's time, violent slapstick without any real story or meaning. Chaplin at this stage was randomly punching people for laughs, which in itself is sometimes funny though something better was yet to come.