Twitter Facebook In her four years at Boston University, Archelle Thelemaque (COM’21) has amassed an impressive list of accomplishments, among them three stints as a student government officer, being a Howard Thurman Center for Common Ground student ambassador, and interning at global public relations firm Ketchum PR. And that only begins to scratch the surface. Now the Posse scholar can add one more accolade: this Sunday, she’ll address more than 3,000 members of the undergrad Class of 2021 as the student speaker at BU’s 148th Commencement. The PR major and Georgia native will share the stage with the undergraduate ceremony’s main speaker, US Representative Ayanna Pressley (D-Mass.), who will receive an honorary degree. (Moderna chairman and cofounder Noubar Afeyan, also receiving an honorary degree, will be the speaker at that morning’s graduate student ceremony.)