Bloomsday
Bloomsday is held on June 16. Dublin, Ireland. This event in the second decade of the month June is annual. 
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Every year, 16 June marks Bloomsday, the day on which fans of James Joyce's 1922 novel Ulysses celebrate this modernist masterpiece. Ulysses is pleasingly devoid of a 'plot' in the accepted sense of the word. June 16 was selected for this celebration because it is the day on which all of the events in the novel take place (June 16th 1904 to be precise). The story is approximately 265,000 words long, so would probably take you about a week to read if you're not doing anything else very much.
Similar holidays and events, festivals and interesting facts
Magna Carta Day in Britain on June 15
Nature Photography Day on June 15
Smile Power Day :) on June 15
Fresh Veggies Day on June 16
International Panic Day on June 18 (Don't worry. Don't fret. and, above all, don't panic);
Go Fishing Day on June 18
International Picnic Day on June 18
Splurge Day on June 18