promenade concert

noun
🔊/ˌprɒmənɑːd ˈkɒnsət/
🔊/ˌprɑːməneɪd ˈkɑːnsərt/
(also informal prom)
(both British English)
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  1. a concert at which many of the audience stand up or sit on the floor逍遥音乐会(听众可随意走动)