It's been a week of celebrations for Henry Kissinger. On Tuesday he turned 91, on Wednesday he broke his personal best in the 400m hurdles, and on Thursday in Copenhagen, he'll be clinking champagne flutes with the secretary general of Nato and the queen of Spain, as they celebrate 60 glorious years of Bilderberg. I just hope George Osborne remembered to pack a party hat.

Thursday is the opening day of the influential three-day summit and it's also the 60th anniversary of the Bilderberg Group's first meeting, which took place in Holland on 29 May 1954. So this year's event is a red-letter occasion, and the official participant list shows that the 2014 conference is a peculiarly high-powered affair.

The chancellor, at his seventh Bilderberg, is spending the next three days deep in conference with the heads of MI6, Nato, the International Monetary Fund, HSBC, Shell, BP and Goldman Sachs International, along with dozens of other chief executives, billionaires and high-ranking politicians from around Europe. This year also includes a visit from the supreme allied commander Europe, and a return of royalty – Queen Sofia of Spain and Princess Beatrix of the Netherlands, the daughter of the Bilderberg founder Prince Bernhard.

Back in the 1950s, when Bernhard sent out the invitations, it was to discuss "a number of problems facing western civilization". These days, the Bilderberg Group prefers to call them "megatrends". The megatrends on this year's agenda include: "What next for Europe?", "Ukraine", "Intelligence sharing" and "Does privacy exist?"

That's an exquisite irony: the world's most secretive conference discussing whether privacy exists. Certainly for some it does. It's not just birthday bunting that's gone up in Copenhagen: there's also a double ring of three-metre (10ft) high security fencing. The hotel is teeming with security: lithe gentlemen in loose slacks and dark glasses, trying not to kill the birthday vibe. Or anyone else.