Steve all but had the plates and food set out when Bucky arrived. The grin was almost comical; he obviously knew the newcomer, because the look of recognition was unmistakable. "Hey! Bucky. Buffet's over here." Granted, the 'buffet' was a small table now overflowing with food, but there weren't other options.
He took a few steps forward to try and relieve his friend of the pasta salad.
"Has everyone met Bucky?" He asked, glancing around the room to find that most of the partygoers had broken off into smaller groups, as tended to happen at parties. Oh well. Bucky was certainly capable of mingling and introducing himself - perhaps even more capable than Steve, who could be a little awkward.