Honolulu Mayor Kirk Caldwell departed Oahu Monday on a business trip to Denmark, Germany and France.

His office said in a press release that Caldwell will be in Europe until Oct. 22 “to attend several key events” where he will represent the City and County of Honolulu.

The first event is the 2019 C40 World Mayors Summit in Copenhagen, Denmark, with travel costs and participation covered by C40.

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Honolulu will be recognized, says the press release, “for its leadership in promoting new technology that utilizes captured carbon in concrete construction.”

While in Copenhagen Caldwell will represent Honolulu at a ceremony with the U.S. ambassador to Denmark in honor of the 9/11 Memorial and Museum.

Caldwell is then off to the city of Coswig Anhalt in Germany at the invitation of its Mayor Alex Claus “to mark the 175th birthday of former Royal Hawaiian Band leader Henri Berger.”

The mayor next goes to the Vosges Region of France to join a delegation from Hawaii at the invitation of Bruyeres’ Mayor Yves Bonjean, “marking the 75th Anniversary of the liberation of the towns of Bruyeres and Biffontaine by Japanese-American soldiers of the 442nd Regimental Combat Team and the 100th Infantry Battalion.”

Managing Director Roy Amemiya Jr. will serve as acting mayor while Caldwell is away.