CREATE TABLE table_29302781_12 (semifinalists VARCHAR(255), week_of VARCHAR(255), runner_up VARCHAR(255))
Who were the semifinalists in the week of 13 November when the runner-up was Pat Du Pré?
    
SQL: SELECT semifinalists FROM table_29302781_12 WHERE week_of = "13 November" AND runner_up = "Pat Du Pré"