The event takes place once a week from Monday 9 AM GMT to Thursday 9 AM GMT or from Friday 9 AM GMT to Monday 9 AM GMT according to the version of Solitaire (check event icons on the main game menu).
All players are split into groups of 50 which compete on a number of stars. To achieve a star you need to bring all Kings home in Tour or Tournament.
Top 3 places are rewarded with:
1st place - 3 magic
2nd place - 2 magic
3rd - 1 magic