Since it is coming up and all, and I vaguely remember there having been issues with the event and ideas or what not. So I'm throwing in my two cents or ideas around to see what could be done to make it awesome. Please move to the correct board if I am mistaken in placing this topic here.
Suggestion ; Volunteer for Infection; instead of having living people taunt the undead once again just to access Skitters shop and the alchemist, maybe have people do a 'zombie for a day' thing? Because it doesn't seem to quite fit with the attitude that's been implied to have happened in recent years. though this is more for making sense from a story perspective; I can understand why this may not happen due to event mechanics.
Or perhaps, in an interesting continuation of a previous years plot with Exchs vs. Skitters, maybe Exchs starts infecting people (revealed later, of course) through pastries once again (a way to set up Fantine and skitters as the culprits). Or just infecting the living as they jaunt about down in the underground, and its up to the users and skitters to find out who's doing it.
or have a plot revealing Elsie as Amy cause I'm pretty sure that's who she really is
Once More with Feeling; Maybe have some NPC come to skitters and/or fantine for advice on how to ask the person of their dreams out? It wouldn't have to be a serious plot, just something cute and fun; could tie in with the sweetheart colors aspects.
Other ideas? Feedback on these ones?