Dress uniforms were a variant of the standard Starfleet uniforms worn for special occasions, such as weddings, courts martial, funerals, and the greeting of ambassadorial delegations and heads of state.
Canada Day in Canada. On July 1, 1867, Canada became a self-governing dominion of Great Britain and a federation of four provinces: Nova Scotia; New Brunswick; Ontario; and Quebec. The anniversary of this date was called Dominion Day until 1982. Since 1983, July 1 has been officially known as Canada Day.
Queen Victoria was born on May 24th but Canadians celebrate Victoria Day on the Monday before May 24. This year Victoria Day is May 23rd, 2016. Victoria Day became a popular holiday in Ontario (it was Canada West back then) in 1845 and a national holiday in 1901. During the 1900s, it used to be called Empire Day and then it changed to Commonwealth Day. Now Canadians call it Victoria Day.