No, or at least they don't have to be. It is up to whoever Invites/Employs them. Most people would be a commencement speaker for other personal agendas such as popularity or image.
It is a fee used to pay for graduation things; speakers, food, ex.........
Barrack Obama Biden Gates
Commencement is when people graduate.
The Professor's Commencement was created in 1902.
Commencement - unofficial - was created in 1999.
Commencement - album - was created in 2001.
commencement date
At the commencement of the meeting, everybody did not expect it to last long.
Commencement - 2008 was released on: USA: 2008 (internet)
Commencement - The West Wing - was created on 2003-05-07.
Au commencement - 2009 is rated/received certificates of: France:U
The date of commencement of course is July 01, 2020eadmission.cipet.gov.in/HelpLine No: 18001218820