The Four Days'' Marches is the world's biggest walking event, and is also one of the world's largest sporting events. Every year the walk starts on the third Tuesday in July. The International Four Day's Marches 2005 will take place from 19 to 22 July 2005. A record number of 53.336 registrations were made, for a total number of 47.500 available places. For me it's the fifth time I'm walking, for my twelve and fourteen year old daughters it's their second and third time.