The ____ of Poker has taken place annually since 1970, in Las Vegas (5,6)

I believe the answer is:

world series

(Other definitions for world series that I've seen before include "Baseball play-off (though only involving the US and Canada!)" , "Annual US baseball championship games" , "a number of baseball games" , "Baseball finals" , "US baseball matches" .)

I've seen this clue in The Times and The Sunday Times.

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