Edwin Jarvis ... brought a tasteful gift, but is a little ill at ease... he still isn't used to the idea of being at a Stark function as a guest.
Stephen Strange dressed sorta casually. Like at the Ball, he came with his Cloak, but once at the party, the Cloak went flying off to a corner where it levitated in place until Stephen called for it again. He brought Tony (MCU) a magical gift, TBD.