Re: Attendees!
Peter and Kamala are Vallo's newest couple (possibly literally; they just had their first date/kiss at the prom last weekend), and so they were probably very new couple-y (minus the PDA). Lots of hanging out together and just getting lost in conversations with the two of them. I imagine that they probably fell behind the group a couple of times while Peter showed Kamala something cool and sciencey (or pretty. "Hey, Kamala, look at this pretty flower." Maybe would've asked Atreus if he could pick something for her?), and had to rush to catch up. They still would've paid attention to their other friends, but they're definitely being honeymoon-y over here.
Katou doesn't have any particular interest in dinosaurs but El asked him to come along so he did! He's in guardian angel mode over here (which is just usual Katou, he's just a little extra vigilant about threats). Please expect some minor complaining about all the hiking, and probably had to be told a couple times to pick up his cigarette butts. He was definitely cursing when the compys nipped at his ankles, but he generally had a good time and was mostly agreeable. He absolutely cheered at Rexy getting her meal. He probably tried getting away most nights to like, the roof of the tree house to star gaze, but if anyone else wanted to join him in star gazing he won't chase them away or anything.