May

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Celebrating on this date...
 
Between Day Japan

Casinga Day

Namibia

Crown Prince's Birthday

Tonga
Festival of Moscow Stars Russian Federation
International Tuba Day International LINK

Kuningan *

Indonesia

National Youth Day

China
Proclamation of Independence, 
Declaration of the Republic of Latvia		 Latvia

Dodenherdenking / Remembrance Day (WWII)

Netherlands

 LINK
Remembrance Day for Martyrs & Disabled Persons Afghanistan
Rhode Island Independence Day USA (Rhode Island)
Kuningan  is a  Hindu Balinese Holiday. Balinese use Caka Year, which is 210 days per year, not 365.  That's why this holiday is celebrated twice a year. See Nov 30th.