Question: what is the most important event associated with swimming?
Answer: freestyle: 50m, 100m, 200m, 400m, 800m and 1500m. backstroke: 100m and 200m. breaststroke: 100m and 200m. butterfly: 100m and 200m. medley: 200m and 400m. freestyle relay: 4 x 100m, 4 x 200m. medley relay: 4 x 100m (men, women, mixed) open water: 10km.