The National Research Council where Cec worked had permanent staff members: Dr Herzberg, the head of the Physics Division, with Alec Douglas, Boris Stoicheff, Don Ramsay, Cec and others; and also Fellows who came from all over the world for 2 years and then usually returned to jobs at home. This meant that an unspoken part of the staffers job was being helpful to the newcomers and making sure their families were getting on well.
For Cyn and Cec, that meant entertaining, and once the summer holidays were over, they held an evening for their friends (possibly wanting Carol to enjoy the people she’d been reading about in Cyn’s letters for the past 4 years, as well as the outfit- Cyn’s skirt was her gift!)
Cec’s camera came out, showing drinks and hors d’oeuvres,
friends and Carol dressed up,
ladies smoking elegantly,
physicists chatting happily,
and the children in pyjamas insisting on saying goodnight as part of the entertainment.