Victoria Day in Canada
Victoria Day in Canada is held on May 18. Earliest possible date of the last Monday preceding May 25. This event in the second decade of the month May is annual. 
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Queen's Day or Victoria Day is a Canadian public holiday celebrated each year on the Monday preceding May 25 in honor of Queen Victoria. This is also the day that the official birthday of the monarch of Canada is celebrated. Victoria Day is also informally considered to mark the start of the summer season in Canada.
The holiday existed before the creation of the Canadian Confederation: it was originally celebrated on the Queen's true birthday, May 24.
Similar holidays and events, festivals and interesting facts
National Day Against Homophobia in Canada on May 17
Energy Conservation Week in Ontario, Canada on May 17 (is about the power of collective action);
National Patriots' Day or Journée nationale des patriotes on May 18 (Quebec, Canada; celebrated on Monday on or before May 24);
National Seal Day in Canada on May 20 (In response to this, Bill S-208 was Royally Assented on May 16th, 2017, designating May 20th annually as National Seal Products Day, and to recognize the importance of the seal hunt for Canada’s Indigenous people, coastal communities and entire population);
Count Every Kilowatt Day in Canada on May 29
Fei Fei Day on June 1 (Vancouver - Vancouver Mayor Sam Sullivan has declared June 1, 2008 a day to commemorate Hong Kong comedienne Lydia Shum. Sullivan designated what would have been Shum's 63rd birthday "Ms. Fei-fei Day.");
Brain Injury Awareness Month in Canada on June 1