Yeah, my apologies about that, but for all his uptightness and being a prat, Percy's been a favourite of mine since I read the books.
I wouldn't say that Alicia so much followed the twins into trouble as much as they were her friends and trouble seemed to happen around her when they were present. But, she was also a teenager and you know how everything and everybody are just unfair to you at that age ;) Yes, to playdates. I see Alicia as still being friends with George and though Percy may not be as close with his family, it is a connection that could have let to interaction away from a Weasley setting. Alicia's kids are attending Muggle school, or will once the school year start, but they still need connections and socialisation with wizarding kids.
LOL. Melinda would remember him, and she probably won't be helping him with having treats or small cookies for the children when they visit. She will try, though, if it looks like he needs help.