In one of Manhattan’s most anticipated social events of the year, 1,700 adventurers, explorers, field scientists, artists and celebrities from around the world will gather at the landmarkWaldorf-Astoria hotel tonight to celebrate the 100th anniversary of The Explorers Club. An annual event held since 1904, this year’s dinner, to be attended by 40 Canadians, takes on the added significance of a centennial function at the dawn of a century when some may feel that there’s nothing left to explore, nowhere we haven’t been and nothing on earth that hasn’t already been mapped.