Bloomsday celebrates the life and work of Irish writer James Joyce and his masterpiece novel Ulysses. The novel describes thoughts and feelings of a fictional character Leopold Bloom as he walked around Dublin on the 16th of June, 1904. That's why this date is observed annually in the Irish capital. Interestingly enough, Joyce chose this date deliberately as it was the date of his first rendezvous with his future wife Nora Barnacle.
Bloomsday Festival commemorates Joyce with a week-long celebration which includes readings from Ulysses, reenactments, performances, excursions and meals. Everything should contribute to recreating the atmosphere of Dublin in 1904. It is a sort of a carnival with many people dressed up in Edwardian costumes and hats.
The epicenter of the festival is the Martello Tower in Sandycove where the first chapter of the novel takes place. Now it is a museum with artifacts related to James Joyce and his famous novel. On June 16th, it hosts readings and gatherings.