query: SELECT T3.Date FROM member_attendance AS T1 JOIN member AS T2 ON T1.Member_ID  =  T2.Member_ID JOIN performance AS T3 ON T1.Performance_ID  =  T3.Performance_ID WHERE T2.Role  =  "Violin"
question: Are Showing the dates of performances with a-attending members what's are "Violin".
query_toks: SELECT T3.Date FROM member_attendance AS T1 JOIN member AS T2 ON T1.Member_ID = T2.Member_ID JOIN performance AS T3 ON T1.Performance_ID = T3.Performance_ID WHERE T2.Role = `` Violin ''
query_toks_no_value: select t3 . date from member_attendance as t1 join member as t2 on t1 . member_id = t2 . member_id join performance as t3 on t1 . performance_id = t3 . performance_id where t2 . role = value
question_toks: Are Showing the dates of performances with a-attending members what's are "Violin".