promoter (n.)youdaoicibaDictYouDict[promoter 词源字典]
late 14c., "one who promotes" (the interest of someone), "supporter," agent noun from promote, and also from Old French promoteur and directly from Medieval Latin promotor. Specific financial sense of "one who leads in forming a company" is from 1876; sense of "one who organizes sporting or entertainment events" is attested from 1936.[promoter etymology, promoter origin, 英语词源]