(CBS News) While the eyes of the world were on Queen Elizabeth II's Diamond Jubilee, another European nation quietly celebrated the longevity of its monarchs.
Norway set aside May 31 for a day of festivities to mark the 75th birthdays of King Harald, who was born on Feb. 21, and Queen Sonja, whose birthday is July 4. Harald has been king since 1991.
The highlight of the holiday was a free evening performance on the roof of the opera house in Oslo, featuring music, dance, readings by performers, speeches and video greetings. The royal family arrived for the celebration by boat.
The Friday events also included a morning reception with the prime minister and Oslo mayor, a performance by more than 3,000 kindergarteners and an afternoon service at the Oslo cathedral.
Portraits of the couple are on a special stamp issued by the Norwegian Postal Service and a special anniversary coin being given away by the Norges Bank.
The royal couple, who were married Aug. 29, 1968, have two children, Crown Prince Haakon, who is married with two children and a stepson; and Princess Martha Louise, who is married and the mother of three.