The history of the intermission
Launch library · evergreen read

The intermission developed partly from genuine practical necessity, giving stagehands time to change scenery or reset a stage between acts, and partly from a simple recognition that a long performance genuinely benefits from a pause, both for physical comfort and for absorbing what has already happened before continuing further.
Audiences quickly adapted their own behaviour around this fixed pause, using the intermission for refreshments, conversation and a chance to stretch after sitting still for a considerable stretch of time, turning what began as a purely practical necessity into a genuinely valued part of the overall evening's social experience.
Modern events retain the intermission for much the same combined reasons even where the original staging necessity behind it has since disappeared entirely through improved technology. The pause itself has become a genuinely expected part of a longer show's rhythm, valued today on its own social terms. This rarely feels pressing weeks out, yet it becomes the very thing that matters most on the actual day.