Celebrations!

Another sunny spring day in Edinburgh today. I walked over 4 miles today, mainly pounding the streets of the city centre from Dalry to Morningside via Haymarket and back again via Lothian Road!
I spotted this string of balloons hanging out of a stair window in Morrison Street.
It got me wondering what the story behind it was....
Not least, why was the display from the stairwell and not one of the flats... was the flat which was celebrating at the back of the stair so had no Street window?
Anyway I hope they had fun!