B.-P. Day
From Scouts Canada Wiki
B-P Day is on the 22 February - a day that is observed by cubs and scouts across the world and it marks the birthday of Lord Robert Baden-Powell
In some countries the a special celebration is held on the Sunday before the 22 February.
Other terms used
The 22 February is also known as Founders Day.
Girl Guides and Girl Scouts call this occasion World Thinking Day.
