A convocation is a group of people formally assembled for a specific purpose, typically ecclesiastical or academic.
Degree being awarded at a University of Toronto convocation
A cadet of the Royal Military College of Canada plays bagpipes in Currie Hall during the college's fall Convocation.
A college convocation banner in India
Interior of Convocation House, Oxford, the meeting place of the university's convocation
A graduation is the awarding of a diploma by an educational institution. It may also refer to the ceremony that is associated with it, which can also be called commencement, congregation, convocation
Convocation
…formally assembled for a specific purpose, typically ecclesiastical or academic. In academic use, it can be a ceremonial assembly of the university for graduation or commencement, or of the institution's alumni. Some institutions hold a convocation at the start of the academic year to welcome incoming students. A synodical…
Students lined up at a graduation ceremony in the United States in the early 20th century
Graduation hats being tossed by fresh graduates of ISB (Hyderabad, India)
Medical student graduation in Avicenna Mausoleum, Hamedan, Iran
King's College London graduands wearing academic dress without caps