Tony + OPEN
A party that was not for him, and in fact, had very little to do with him - the super-secret think tank him and the Wakandan King (and several of the guests in attendance, come to that) notwithstanding - was a rarity in Tony's world.
Still. That wasn't all bad. He could wander the ballroom, have a drink, dance with Pepper and not have her running off to make sure that the ice sculpture wasn't melting too quickly, poke into T'Challa's various tech in the embassy and not get roped away from it...
...well, possibly yanked away from it much faster than he would if it was indeed his party. But really, it was a force-field: there was just the slightest crackle of his arc reactor as he passed through, one energy field protesting the presence of another, and nothing would do but for him to investigate what had caused it, and then exactly how they had managed it as he was having difficulties with his own applications of it...
He managed to whip the phone with diagnostics away and practiced his most innocent smile within seconds. Yeah. That would work. It might not even end up with him confronted by very scary Wakandan guards.