main act
compound.the most important performer or group at a concert or show. They usually perform last after the smaller acts have finished.
compound.the primary performer or ensemble in a multi-act entertainment program, typically receiving top billing and performing the final, longest set.
“We arrived late and almost missed the main act.”
“The crowd grew restless during the long wait between the opening bands and the main act.”
“While the supporting performers were talented, the main act commanded the stage with a level of charisma that justified their headliner status.”
often used interchangeably with 'headliner' in the context of music festivals and comedy shows.
contrast this with 'opening act' or 'support act' to help students understand the hierarchy of a performance schedule.