What is the name of this event held from 30 August to 6 September 1981, in which Reima Karppinen won a silver medal?
Reima Karppinen: Reima Juhani Karppinen (born 27 January 1958) is a retired Finnish rower who specialized in the double sculls. Reima Karppinen:  In this event, he won a silver medal at the 1981 World Rowing Championships, together with his legendary brother Pertti. 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.
1981 World Rowing Championships