Question: What is the name of this event held from 30 August to 6 September 1981, in which Reima Karppinen won a silver medal?

Context paragraphs:
Andreas Birnbacher: Andreas Birnbacher (born 11 September 1981) is a former German biathlete.  His biggest successes were the silver medal in the mass start event at the 2007 World Championships and the gold medal in the mixed relay at the 2008 World Championships.  He also won the bronze medal at the 2012 world championships in Ruhpolding when he was part of the German teams that finished third in the mixed relay and the men's relay.

John Lindsay (Paralympian): John Lindsay, OAM (born 29 January 1970) is an Australian Paralympic athlete from Melbourne.  He competed in the 1988 Seoul games in distances ranging from 100 m to 800 m, but did not win any medals.  At the 1992 Barcelona Games, he won a gold medal in the Men's 200 m TW3 event, for which he received a Medal of the Order of Australia, a silver medal in the Men's 100 m TW3 event and a bronze medal in the Men's 400 m TW3 event.  That year, he had a Victorian Institute of Sport scholarship.  He was also working as a fitness instructor in 1992, held world records in the 100 m and 200 m events, and was ranked 6th in the world in the 400 m.  He won a gold medal in the men's athletics 100 m T52 event at the 1996 Summer Paralympics with a time of 15.22, a silver medal in the 200 m T52 event with a time of 27.38, and a bronze medal in the 400 m T52 event with a time of 52.93.  At the 2000 Sydney Games, he won a gold medal in the Men's 100 m T53 event, a silver medal as part of the Men's 4x100 m Relay T54 team, and a bronze medal in the Men's 200 m T53 event; he was also part of the Men's 4x400 m Relay T54 team, which was the only one to qualify in its heat, but it did not make it to the finals.  At the 2004 Athens Games, he came seventh in the first round of the Men's 100 m T53 event and sixth in the third round of the Men's 200 m T53 event.  He was an Australian Institute of Sport scholarship holder in 1995 and 2000.

Vivian Cheruiyot: Vivian Jepkemoi Cheruiyot (born 11 September 1983) is a Kenyan long-distance runner who specialises in track and cross country running, olympic champion in 5000 metres event.  She represented Kenya at the 2000 Summer Olympics, the 2008 Summer Olympics, the 2012 Summer Olympics and the 2016 Summer Olympics, winning a silver medal at the 5000 m and bronze medal at the 10000 m at the 2012 Olympics, silver medal at the 10000 m and gold medal at the 5000 m at the 2016 Olympics, setting the new Olympic record in 5000 m event.  Cheruiyot won a silver medal in the 5000 metres at the 2007 World Championships in Athletics and became the world champion in the event at the 2009 edition, repeating this achievement at the 2011 World Championships, where she doubled up by winning the 10000 m.

Michael Alston: Michael Alston is an Australian disabled fencer.  He competed in the 1998 FESPIC Games and won a silver team medal.  At the 1998 Stoke Mandeville Games, he won a gold medal in the foil event.  That same year, he also competed at the DEFI Sport Event held in Canada.  He won a silver medal in the épée event and a bronze medal in the sabre event.  He was supported by the Blacktown City Council and was coached by Sally Kopiec.

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.

EuroBasket Women 1981: The 1981 European Women Basketball Championship, commonly called EuroBasket Women 1981, was the 18th regional championship held by FIBA Europe.  The competition was held in Italy and took place from 13 September to 20 September 1981.  won the gold medal and the silver medal while won the bronze.

Reima Karppinen: Reima Juhani Karppinen (born 27 January 1958) is a retired Finnish rower who specialized in the double sculls.  In this event, he won a silver medal at the 1981 World Rowing Championships, together with his legendary brother Pertti.  He competed at the 1984, 1988 and 1992 Summer Olympics, with other partners, and finished in 8th, 12th and 13th place, respectively.

Brigitte Totschnig: Brigitte Totschnig (later "Habersatter", born 30 August 1954) is a retired Austrian alpine skier.  She competed at the 1972 and 1976 Winter Olympics and won a silver medal in the downhill in 1976.  Totschnig finished seventh in the downhill at the FIS Alpine World Ski Championships 1978.  Between 1975 and 1977 she had seven victories and 13 podiums at the World Cup, 11 of them in downhill; her best overall placement was fourth in the 1976–77 season.  She retired after the 1977–1978 season, in which she won national titles in the downhill and combined.  In 1978 she built the Aparthotel Olympia in Filzmoos and ran it since then.  Totschnig was named Austrian Sportswoman of the Year in 1976 and in 1996 was awarded a silver medal for services to Austria.  Her father-in-law, Walter Habersatter, competed for Austria in ski jumping.

Igor Novikov (pentathlete): Igor Novikov (Russian: И́горь Алекса́ндрович Но́виков , 19 October 1929 – 30 August 2007) was a Soviet modern pentathlete and Olympic Champion.  He competed at the 1956 Summer Olympics in Melbourne, where he won a gold medal in the team competition (together with Aleksandr Tarasov and Ivan Deryugin.  He won a silver medal at the 1960 Summer Olympics in Rome, and he competed at the 1964 Summer Olympics in Tokyo, where he won a gold medal in the team competition (together with Albert Mokeyev and Viktor Mineyev), and a silver medal in the individual competition.

Paul Lake (cyclist): Paul John Lake, OAM (born 6 June 1970) is an Australian Paralympic cyclist.  He was born in Melbourne.  He won a silver medal at the 1996 Atlanta Games in the Mixed Omnium LC2 event.  At the 2000 Sydney Games, he won a gold medal in the Mixed Team Olympic Sprint LC1–3 event, for which he received a Medal of the Order of Australia, a silver medal in the Mixed Individual Pursuit LC2 event, and a bronze medal in the Mixed 1 km Time Trial LC2 event.  He was an Australian Institute of Sport scholarship holder in 1995 and 1997.

Supporting paragraphs: Reima Karppinen 1981 World Rowing Championships
Answer: 1981 World Rowing Championships