Hey Anna!
Sounds like your friend is familiar with Joyce's work and it's great that he'll be in Dublin on June 16! I bet he even read Ulysses in its entirety.
I haven't had the chance to attend the celebrations myself but, as Cathaoir said, a few people previously shared
tips about the Bloomsday festival.
There are indeed traditional spots that host performances and readings every year, such as the Glasnevin Cemetery, Davy Byrne’s pub as well as James Joyce Tower and Museum in Sandycove. You can find
a map on the festival's website to make sure your friend doesn't miss anything.
Happy Bloomsday to him and let us know if he needs any other suggestions for
literary attractions in Dublin.
Antoine