Stuart and Peter Parker
For Peter, the only thing to celebrate was the fact that he hadn't had to go back home. He never wanted to go back there. It was a little embarrassing to him that he was so afraid of the idea, but he wasn't ready to die yet. Not even a little. And it wasn't like he could go back and help people because as soon as he went back he was dead. Gone. Turned to dust by Thanos and his craziness. So he was definitely celebrating the fact that he was still here and still alive.
He got a plate of food and looked around, a bit of wonder in his eyes. This place had become his haven, the only life he had left, and he entirely intended to enjoy it as much as he possibly could.
Seeing the guy who was just a few years older than him, he smiled awkwardly and gave a half-wave.