El! *hugs* Loves for you! Sorries for missing the invites! But let's plots!
Penny loves K and there really isn't anything you can do about it. She won't admit it but she likes healing for the WS better than her job at the hospital. They are much cooler (and nicer) than her usual crowd. Tickets to every event is required! Elliot should expect to be spoiled. Surely they are friends! If he knows Bill too, maybe Fleur is friends with him too? She's being converted into being a fan!
Perhaps Penny has treated Marcus too for that occasional quidditch injury or two? She might be a fan too as she is quite the quidditch fan too. I can't really see where they wouldn't get along, it's Penny after all. Alexander is a fan too even if he thinks there are better things he could be doing with his time than playing quidditch.
On that note, Alexander would like Fred to go walk off a cliff. They should have lots of evil plots and run ins because the Weasleys are a thorn in his side. Penny says hi too because maybe they met when she dated Percy for a while? The could at least be on friendly terms! Fleur says hi too and since she's married to his brother they know each other. She likes Fred and George, they kinda amuse her with their jokes, so as long as they don't call her Phlegm (to her face anyhow) they'll get along just fine!