Prior to getting my black belt, the head instructor/owner asked me to be there, but I assumed it was because I was one of the higher belts and he wanted me to help. So I didn't invite anyone.
After getting promoted to black belt by surprise, I called my wife and excitedly told her and she just said "oh that's nice, can you pick up lunch?" (She was on painkillers at the time and was asleep). So I drove home with a new belt and Tex Mex.
But my instructor (now a coral belt) laughed and shared a funny story about his promotion to black belt and the casual nature of it and I felt better.
Consistency: It's only a virtue if you're not a screw-up.