Gilderoy & Open.
Gilderoy was fashionably late and looking quite fashionable, dashing and otherwise perfect in his suit. He opted to have no date, as he thought it might be nice to get out and do things without having to nurse some parasite at his side all evening. Plus, it made him look accessible and gave women the impression that they had a chance. When running into such girls (almost immediately upon showing up, might he add), he flashed his best (not that he had a worst) smile at them, taking a photo with one and giving an ever-coveted "good evening" to the other.
After gracing those near the entrance with his presence, Gilderoy headed straight for the spot that was likely to have to most "good" press: the donation booths, of course. And he donated, at least though any good will that might have accompanied the gesture would be sucked out by the fact that he (subtly) waited for when his photo could be taken while he did such a generous act.
Once all of that was done with, Gilderoy was left to his own devices for a bit before he'd inevitably be sucked into the social obligations of photos with various other high-society people. Oh, how difficult it was to be him sometimes.