In the 1976 Summer Olympics, Bruce Jenner won a gold medal in the Decathlon.
Track and Field
It has been in every summer Olympics since the first modern one in 1896. But it was also an important sport in the ancient Greek Olympics, which happened many times.
Field hockey becomes a medal sport for women in the Olympics. The Zimbabwe women's field hockey team went undefeated to win the Olympic gold medal.
No. Basketball is played at the summer olympics.
Wrestling is a Summer Olympics sport.
Though it can concievably be played year-round, Cricket has traditionally been a Spring/Summer sport, appearing once in the Summer Olympics in 1900.
Kitesurfing is the newest sport in the Summer Olympics. It will make it debut in the 2016 Summer Olympics in Rio de Janeiro.
you can do it all year round but it is classed as a summer sport in the olympics.
At the 2008 Games, that would be softball.
The summer Olympics allows fencing to be played around the world but is mainly a European sport.
Croquet?? Not really sure, just a guess