Natasha Romanoff and OPEN (multiples welcome)
Natasha had been supervising the party, floating around to talk from guest to guest and making sure her husband didn't burn the food (He hadn't. So far). She seemed to be completely at home with the role, far from her usual more calculated self.
She kept the conversations light, lingering mostly near the food table to ensure people were happy and that everything was refilled, though she would occasionally step over to a person here or there to welcome them in. Her manners were always on par and she appeared the perfect housewife.