Re: Who came?
Imagining Yelena like sneaking up to the table as people and old ladies and children and who knows who else are just casually walking up and taking food and lingering, chatting.
I think Steve and T'Challa both are the sort who on paper feel like a barbecue shouldn't be a place to talk business. But then 100% will absolutely talk business at a barbecue. So as much as he probably should be doing that whole king / host thing and mingling, they can probably get an aside for a fairly in depth conversation on that.
I feel T'Challa is interested in getting to know Sharon a bit more too.