According to Wikipedia, A commencement speech is a speech given to graduate students, usually at a university, although the term is also used in secondary education institutions and similar institutions around the world. Commencement is a ceremony in which degrees or diplomas are awarded to students upon graduation.
Here are some commencement speeches which I think may add some value to your life :
1. Steve Jobs' 2005 Stanford Commencement Address :
2. Bill Gates, Harvard Commencement 2007 :
3. JK Rowling Harvard Commencement Speech | Harvard University :
4. Mark Zuckerberg Harvard Commencement Speech 2017 :
5. Oprah Winfrey Harvard Commencement speech | Harvard Commencement 2013 :
Please do note that all the above suggestions are my personal opinions and are shared for informational purposes. All the legal rights of respective videos belong to their owners.