Nina
As a gift to Demi, Nina is not only briefly attending the event but even wearing one of Demi's dresses. She's obviously out of her element with both the company and the outfit, but she's making do as best as she can and interactions are likely positive, rather than negative. I'm open to anything short or handwaved with Nina, and she brought a $15 gift card to the local movie theatre as her gift because gag gifts are immature.