Finn was looking all round at the strange new place he found himself in, following after a guy called Tommy who'd said he could get a lift out to the party with him. He did some digging around on the network while the vehicle took them out through the forest, and realized that Tommy was Sookie's younger/older brother (he wasn't too sure just yet), so that was kinda cool, right? Big families, celebrating birth anniversaries, huge big mountains that let people have parties inside them... sure! Tommy had been fairly quiet at the start of the journey, but once he worked out that Finn had been in space and knew all sorts of stuff about space, it was very hard to get the other guy to shush, but that was okay. It was like when Poe or Rey got talking about flying or stuff like that.
Tommy walked past, carrying a double armful of... components? Lenses and tripods and things, and nudged Finn in the arm before nodding over at the girl who was waving at him. "That's Sookie. The birthday girl!"
"Oh! Right, yes. Birth day, got it," he replied, and walked over to say hello.
"Hi. I'm FN... Finn. I'm Finn. Thanks for inviting me," he said with a smile once he was close enough, then remembered what he'd been told was the right thing to say. "Happy birth-day, Sookie."