so lily has a cat that she absolutely adores with her entire being and spoils rotten and she could potentially know him from his job working in the magical menagerie? also, she's one of skittles number one fans and knows a lot of the people who frequent the place. so there are definitely reasons for them knowing each other - possible friends/acquaintances?
and della's an extremist too, so i'm sure they would know each other from various political... things? (wow, i'm so eloquent.) right now i don't think my mind is in the right gear to come up with any ideas for chaos they'll bring about but i'm sure they will, and we can get other extremists involved in the action.