Clark looked through the agendas of his wives and selected a few that would fit in with the wives of the host and the other guests. Aside from Lois, Lana and Lori he decided also to bring along Chloe Sullivan-Kent who was quite at ease
with upper class people.
Clark decided he needed to bring at least eleven of his wives, just to remind the
Dork Knight who had the largest harem around (as Batman only had ten wives). Although Bruce would always go and say "quality over quantity", while reminding the
Wuss of Steel who Wonder Woman had chosen between Batman and Superman by making out with said woman in front of everyone, Clark never thought that his wives had less standing than Bruce's.
Claire Selton-Kent, the reformed villain Volcana (from DCAU/STAS, see http://dcanimated.wikia.com/wiki/Volcana ), had also a lot of experience mingling with the rich and famous. Likewise did Mercy Graves-Kent, who had been Lex Luthor's bodyguard, and Leslie
Willis-Kent aka Livewire, another reformed villain and former shock jock.
Superman had many wives that had been his rogues prior to their marriage with the Man of Steel. Among them was Lourdes Lucero-Kent, the ex-villain Encantadora, who Clark thought would go along pretty well with Zatanna as both women were magicians. Clark had
also managed to convince the Female Furies Gilotina and Lashina to leave Apokolips and become his wives. The two former furies could need some experience socializing with people as they rarely left his side.
That already made eleven wives, but just to rile up Bruce some more, Clark decided to bring along Vicky Vale-Kent. During his courtship with Vicky, Bruce had hesitated for too long before telling her about him being Batman, thus explaining why he was always
so busy. Superman used the opportunity to cheer up and console Vicky. He ended up proposing to her as she reminded him a lot of Lois.
Now the Man of Steel had yet to tell his wives to get ready or they would be late for the party at Wayne Manor.
(So I've also added Zatanna to Bruce's roster of wives, leaving three free spots. I didn't specify how many wives did Superman have, so it's up to someone else.)