The really big ones call for fancy bubbly at fancy restaurants.
So for sister-girl’s graduation, we went to a fancy restaurant (where she works most other days) and partied like it was going out of style. Mostly by gorging ourselves on delicious food and guzzling the complimentary sparkling wine, which was accompanied by a hand-written history of the vintage & vineyard. Because stuff like that happens when they like you at work and you get fancy degrees.
Don’t mind my funny expression–the waiter taking our picture said to say something funny, and I was just yelling our last name.