If you are referring to the Winter Olympics, the four indoor events are speed skating, figure skating, curling, and hockey.
There are a multitude of indoor events that take place during the Summer Olympics. All head-to-head "combative" sports (fencing, boxing, Martial Arts, Wrestling, etc.) take place indoors. All gymnastics occur indoors. Basketball and traditional volleyball are played indoors. And indoor sites are encouraged for swimming and diving events to prevent delays due to weather.
There are four Winter Olympic events that are held indoors. They are speed skating, figure skating, curling and ice hockey.
The olympic city and stadium have to be built , and it takes roughly four years to complete.
The Olympic sailing events are typically held during the summer Olympic Games, which occur every four years. For the Paris 2024 Olympics, the sailing competitions are scheduled to take place from July 27 to August 8, 2024. The events will be held at the Marseille marina in France.
The FIFA World Cup will be held in 2014 and the Olympic Games will be held there in 2016.
velodrome
301 events in 28 sports were held at the 2004 Olympic Games in Athens.
javeling
Gymnastic and swimming.
302 events
Equestrian.
Stratford
England in four years