In 1981, playwright, performer and theater company director Carlyle Brown decided on a whim to take a trip to Africa. That launched a journey of self-discovery and an adventure that became the basis for a one-man show called “The Fula from America: An African Journey," which Brown performs tonight at The Music Hall in Portsmouth. It’s a fund-raising event for Portsmouth’s African Burying Ground, and will be followed by a candelight procession to the site where the design for a memorial will be unveiled.