[ Steve doesn't do a good job of hiding the fact he's pleased that Loki ate something. It might have only been to humor him, but it still counts. It's a step forward. ]

They're celebrating a person, so I guess it depends. They're important to the people close to someone because it's a chance to let them know how much they appreciate them. The time they've had together. Some people don't think too much of them, but when you live on the move for long enough, you grow to appreciate the moments that you get.

[ Which, of course, leads Steve to a counter question. ]

I guess they don't do birthdays on Asgard?