What is the proper way to address college grad invitations?

There are pre-printed ones if you are inviting people yourself. If your parents are doing the inviting, they may have engraved invitations made up, for which the printer has examples, but usually the say :

Mr& Mrs Edward Winston would be honored for you to attend the graduation of our son, Walter , as he receives his -----------degree in -------- from Loyola University. Commencement will be June 3, at 2 PM.

RSVP , as Guest seating is limited.