Astoria showed up with Draco, trying not to look quite as thrilled to be there, with Draco, as she felt, though that's still pretty thrilled. She brought flowers, of course, a few small arrangements like this or these, and proceeded to track down one of the hosts and offer them up as decorations, as long as they made sure they went home with Megan, because they were a present.
Story loves a good party, and will talk to anyone who wanders into earshot, so if you want your character to meet her but don't feel like bothering with IC introductions, here's your chance! She will make an effort not to trail after Draco like a puppy (though she won't often let him out of her line of sight, either), so there will be plenty of opportunities to socialize.