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 "Reima Karppinen"): He competed at the 1984, 1988 and 1992 Summer Olympics, with other partners, and finished in 8th, 12th and 13th place, respectively.
Relevant evidence: No