Largest ice hockey tournament

According to Official Guinness Records,

The largest ice hockey tournament was the Hockey Calgary 37th Annual Minor Hockey Week Tournament which was contested by 664 teams totalling 10, 922 players in Calgary, Alberta, Canada, from 5 January to 13 January 2007.
957 games were played over the week on 42 different ice sheets in 34 ice rinks across Calgary. There were 2,694 coaches and 450 referees used during this tournament.

For a complete list of 2007 records, please visit 2007 Guinness Records in Canada.

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