Mother's Day in Hong Kong
Mother's Day in Hong Kong is held on May 4. Also Hungary, Lithuania, Mozambique, Portugal, Spain, Romania; celebrated on the first Sunday in May. This event in the first decade of the month May is annual. 
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Every Mother's Day there are approximately 152 million Mother's Day cards sent. Carnations have a special meaning on Mother's Day. Anna Reeves Jarvis used the carnation on Mother's Day to symbolize whether your mother was living. A red carnation meant she was, and a white meant she had passed.
Due to its long tradition of Confucian filial piety, some may argue that every day is Mother's Day in China. But since the 1980s, the country has taken a cue from its Western neighbors and celebrated moms every second Sunday in May, often with bouquets of red carnations.
A meme you might have seen says Mother's Day is the day with the lowest crime each year. But there is no evidence to back that up. The website Snopes did a rudimentary check of the available data and found nothing unusual about the number of arrests on Mother's Day.
Similar holidays and events, festivals and interesting facts
May Crownings or the Virgin Mary Month on May 1 (Catholic Church tradition);
Lusophone Culture Day or World Portuguese Language Day on May 5 (Community of Portuguese Language Countries);
Independence Day or King's Day in Romania on May 10 (celebrates the declaration of independence of Romania from the Ottoman Empire in 1877);
Father's Day in Romania on May 11 (Celebrated on the second Sunday of May);
Mamertus, the first of the Ice Saints on May 11
Catholic pilgrimage to Our Lady of Fatima in Portugal on May 13
European Natura 2000 Day on May 21
Day of Patriots and Military in Hungary on May 21