The solitary pursuits of writing and reading move into the public arena at the 11th annual PEN World Voices Festival, a weeklong series of performances, readings, panel discussions, and lectures by more than 100 acclaimed writers. This year the festival spotlights work from Africa, with Nigerian novelist and 2013 National Book Critics Circle Award winner Chimamanda Ngozi Adichie presenting the Arthur Miller Freedom to Write Lecture and co-curating the Africa program. Other events include Luc Sante and Michael Ondaatje discussing memoir, and Tom Stoppard speculating about humankind in the year 2050. Events throughout the city; May 4–10.