headliner
n. B2 Upper Intermediate US //ˈhɛdˌɫaɪnɝ// UK //hˈɛdlaɪnɐ// head·lin·er
n. the most famous or popular performer at a concert or event. You usually see their name at the top of the poster.
n. the principal performer or attraction at a concert, festival, or event. Often used in the plural to refer to the most prominent acts on a bill.
The band is the headliner for the summer festival.
Despite the smaller acts being excellent, the crowd was waiting for the headliner to take the stage.
The festival's lineup features several international headliners, ensuring that the final night of the event will be the most attended of the week.
From headline (verb) + -er.
From head + liner.