Thor and Open [multiples welcome!]
Thor had spent a few wintertimes on Midgard for the holidays, but this might have been the first time he'd ever been invited to a Christmas party. He did a little research into what normally transpired during these events, and ended up purchasing a Christmas Sweater. He didn't completely understand the custom, but the thing was warm and soft. He quite liked it.
He arrived to Stark's tower, and took a few minutes to wander the floor, looking at the decorations. There was something absolutely magical about wintertime on Midgard--the lights! The music! Even though there was no snow in San Francisco, it was still a joy to be there surrounded by friends, trees, lights, and listening to carols. Then Thor turned to greet whoever was around with a hearty laugh and a warm smile.