The last of the Sheva Brachot lists 7 girls:
Gila, Rina, Ditza, Chedva, Ahava, Achva, and Re'ut. Shalom is the only boy that was invited. Why couldn't they invite other boys. Don't any of these other girls need shidduchim? Why should they all have to fight over Shalom?
FYI - I don't know of anyone named "Sasson" other than Vidal, and there, it's his last name. "Simcha" can be either a boy or girl's name.