Those who are brave, noble, or just plain stupid, try to do all 3 within the space of 24 hours - The Three Peaks Challenge. There is no official body, or definition of the Three Peaks Challenge. Either the corridor route from Seathwaite or the steeper, shorter route from Wasdale Head. Starting from the Youth Hostel in Llanberis Pass, the Pyg Track and Miners Track are the most popular routes. There are variations on the challenge, including the Three Peaks Yacht Race, where partcipants sail between the peaks.
Some people do the challenge as part of a large, organised groups.
Others prefer to make their own arrangments, and travel in small groups, with or without a support team.