Question: What is the name of this event held from 30 August to 6 September 1981, in which Reima Karppinen won a silver medal?
Sentence (from "1981 World Rowing Championships"): The 1981 World Rowing Championships were World Rowing Championships that were held from 30 August to 6 September 1981 at Oberschleißheim outside Munich, Germany.
Relevant evidence: Yes