Answer:
_______ speeches are often given at a graduation ceremonies
Step-by-step explanation:
An act of graduation is the official ceremony that closes the school year and serves as recognition to the students who, throughout it, have completed the academic requirements of a curriculum.
The act has the presence of academic authorities and is usually chaired by the rector or director, who can invite a relevant personality of social and cultural life to act as sponsor of the promotion and deliver a speech: commencement speech, is the name.