Just found this which must be from the same occasion. Annual dinner and dance of the Anglo-Danish Society at the Dorchester in London on 20th October 1966. pic.twitter.com/Ty7rPzVMKQ

— JR 🇪🇺 (@Jakreg76) December 16, 2019

Princess Margaretha of Sweden and Denmark (wearing Princess Ingeborg’s Turquoise Star Tiara) was joined by her daughter-in-law, Princess Anne of Denmark (in her Diamond Tiara), and sister-in-law, Princess Margaret of Denmark and Bourbon-Parma (wearing Princess Marie’s Floral Tiara), at the Anglo-Danish’s annual Society Dinner and Dance at the Dorchester Hotel in London on this day in 1966.

Then Crown Prince Frederik and Crown Princess Ingrid attended the Anglo-Danish Society’s Dinner in London in 1939, Princess Benedikte attended the Society’s Dinner in 1962, as did Queen Margrethe and Prince Henrik in 1974, and most recently Queen Margrethe attended the Dinner in 2019.