The phrase "main theatre" lacked significance for those institutions that had a single traditional stage only.
By the end of the 20th century the term "main stage" was well established as a description of traditional western theatres and the productions performed in them.
They are commonly held outdoors, and are often inclusive of other attractions such as food and merchandise vending machines, performance art, and social activities.
In strip clubs, the main stage is where the currently featured performer will dance as part of a rotation.
During each set of one or more songs, the current performer will dance on stage in exchange for tips.