The iconic Bonspiel is New Zealand's major tournament in the traditional crampit form of the game. The event is called only when there is sufficient natural ice on an outdoor rink. Oturehua's Idaburn Dam has been the venue since 1932, except for 2015 when Naseby's Centennial Ponds were used.
Two rinks (teams) from each club play 4 games each over 2 days, with the winning club being the one with most wins from their 8 games. Total points scored is used to separate clubs with the same number of wins