[Gaeta is not always an inherently awkward person, but he can't help but feel out of place at this themed party where he knows almost no one and the theme is wholly foreign to him. Regardless, he's dressing up (without the sword), playing along, and trying not to panic whenever a bot buzzes by.
Food? He still can't believe how much food there is around here, so he picks at a variety of dishes without eating much at all. Games? Great to observe. He won't jump into any because that would involve finding someone to play with, but watching people beat each other with toy weapons and wrestle is entertaining.
Dancing? Well... he'll be there, but mostly in a standing-around-and-wondering-how-people-without-friends-get-in-on-this-dancing-thing capacity.]