Can anyone see what the food on the table is? that would give a clue to the type/season of the meal.
The flowers suggest Spring/early Summer- maybe Easter/Whitsun .
The "half" curtains suggest a cafe or similar as do the type of chairs. ( if it was a chapel "treat" in chapel rooms or a civic hall , fold-up chairs would be more likely, perhaps)
It seems incredible, but I can remember seeing older people in clothes like the ones pictured when I was a child in the 1950's: wrap-around flowered pinny-overalls, fox-fur tippets incl.fox's head and feet!, hats indoors etc.