Conversation so far:
who designed the queen mother's wedding dress
Inspired by the drop waist style ushered in by Coco Chanel, the embroidered gown was created by Queen Mary’s court dressmaker, Madame Handley Seymour.
how many times did the queen mother refuse king george's proposal
It took George VI three tries to get the Queen Mother to accept his marriage proposal.
when did the queen mother meet george the sixth
Queen Elizabeth, the Mother Queen, first met the King George VI when he was still Prince Albert, Duke of York in June 1920.

Question: when did the wedding take place
Self-contained rewrite: when did the queen mother and king george the sixth's wedding take place