I believe it's in regards to that on June 20, 1868, a proclamation signed by the Governor General, Lord Monck, called upon all Her Majesty's loving subjects throughout Canada to join in the celebration of the anniversary of the formation of the union of the British North America provinces in a federation under the name of Canada on July 1st.
In a nutshell - very impressive Teresa, except that we turned 141 today so it was actually 1867. Was history one of your better subjects??