non-performer  
noun [ C ] (also nonperformer) uk/ˌnɒn.pəˈfɔː.mər/ us/ˌnɑːn.pɚˈfɔːr.mɚ/
  (ENTERTAIN)      
  非表演者
a person who does not perform as an actor, singer, dancer, or musician
  He was voted into the Rock and Roll Hall of Fame as a non-performer. 他以非表演者的身份被选入摇滚名人堂。 
 The award is open to musicians and also nonperformers who have had an influence on American music.
 - More examples
 - One member of the group left because her non-performer boyfriend objected to the content of the show.
 - The songwriter and producer was honoured in the non-performer category.
 
  (DO)      
 表现不佳者
someone or something that does not perform well
  We try to sort out the good workers from the non-performers.
 She thinks that I am a nonperformer who is only good at making excuses. 她认为我是一个只会找借口的无能之辈。 
 - More examples
 - Headteachers should be able to fire nonperformers on their staff.
 - I am surprised that anyone can praise this non-performer.