Gay Uncle's Day or Guncle's Day
Gay Uncle's Day or Guncle's Day is held on August 8. It is celebrated on the second Sunday in August. This event in the first decade of the month August is annual. 
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The holiday was conceived and first promoted Facebook user, C.J. Hatter, but received visual attention online when former Rugby player, Simon Dunn, posted on his Instagram asking people if they wanted to celebrate "Gay Uncle's Day" on Sunday, August 14.
Source: wikipedia.org
Similar holidays and events, festivals and interesting facts
Lighthouse Day on August 7 (day of workers of means of navigation equipment of the coast of large reservoirs in the form of a capital structure);
National Clown Day in USA on August 7 (Saturday of Clown Week);
Clown Day in Netherlands on August 7 (In Netherlands, they call it Internationale clown dag);
Clown Day in Italy on August 7 (In Italy, they call it Internazionale pagliaccio giorni);
Clown Day in Norway on August 7 (In Norway, they call it Internasjonal klovn dag);
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