You also took the time to get the best invitations that money can buy so you only invited 30 people because that was the exact amount of people you wanted, no more, no less. An hour and a half goes by and about 10 people show up. Towards the end 9 more people show.
You are totally devastated but still manage to enjoy yourself. The lesson you gained from this experience is invite them all, because only 65%-75% will show.