I believe I invited him in my post. I'd forgotten about Tony Stark, so I made sure to invite him. So, at this point, I'd like to run by you all the story for the party i have in mind. In attendance will be:
Lex Luthor
Wilson Fisk
Tony Stark
Bruce Wayne
Clark Kent & Lois Lane (covering the story, maybe with Jimmy Olsen?)
Peter Parker (also covering the story)
As well as you know, Bill Gates and other real life business moguls and celebrities.
At some point in the party, everyone overhears about a madman who's threatening to blow up the Star City bank, killing everyone inside, if he doesn't get what he wants (I'm thinking some terrorists freed or something like that). All the heroes find reasons to excuse themselves, and they all run into each other outside the bank, making for some memorable dialogue (I'm looking forward to the repartee between Spidey and Green Arrow, myself), before they go in and attempt to defuse the situation. That's when they realize that the guy with the bomb is a front while an armed group of about forty terrorists rob Star City blind. We all do our superheroic thing, saving the day and all that, and get to know each other briefly before heading back to the party.
How does that sound?