Attend a show at the Colosseum, as well as a pastime, often represented an endurance test: both games and fights lasted for a whole day and the audience was exposed to all climatic conditions.
First of all it was important to be able to sit comfortably but, especially in the higher sectors where the space decreased, it was not always possible and the spectators were even used to bring pillows from home not to sit on the hard stone seats.
The Emperor Augustus tried to schedule the performances in the cooler months, but in Rome each occasion was good for a celebration or a commemoration even in the summer months, and then another big problem was the heat.