Class & Charter Day Celebrated - Academic achievement prizes, prize scholarships and other recognition of student accomplishments were awarded at Hamilton’s 63rd annual Class & Charter Day convocation on May 13.
commas between two independent clauses
Use a comma to separate two independent clauses linked by conjunctions such as and, but, or, so or yet: "She smiled as she accepted her diploma, but a tear slid down her cheek when she turned to face her classmates." "She smiled as she accepted her diploma but started to cry when she turned to face her classmates."
SOURCE: Hamilton College Editorial Style Guide