You start checking around Buffy's house, ostensibly helping with prep for the dinner but really to try and make sure that the place is as secure as possible against any undead. The problem of course, is that you don't really deal with zombies. Vampires sure, any day of the weak. Spirits and demons too sometimes. But zombies? Not something you have experience with.
Your Van Helsing memories are only loosely useful here, as the memories revolve around the restless undead and how to keep someone from becoming a zombie, rather than warding against an attack from one. It does get you wondering if the graveyards in Sunnydale are consecrated at all. Can they be if they have vampires coming out of them all the time?
[ ]Look into the consecration of the graveyards later
[ ]Leave it be, it's not really your area
When Sofia shows up she asks what you're doing, and you explain to her about the potential undead problem. You assure her that you'll all do your best to make sure the dinner goes well, zombies or not. You want to give her a good send off after all, especially after you exchanged emails. You don't want Sofia to decide to not contact you if she needs someone. Sofia moves on to speak with Buffy. The two slayers are awkward with each other, but Buffy seems genuinely happy to see Sofia and spend time with her.
The party actually goes quite well, until Giles calls the house. Buffy's mother isn't too pleased with the school librarian calling in the middle of dinner, respected by Buffy or not. Buffy manages to make an excuse and take the phone, just in time for the undead to start banging on the doors.
The good news is you managed to seal up the house fairly well, so the zombies have been stuck just banging around the outside of the house so far. The bad news is, there's a lot more than you were expecting. It looks like an entire cemetary woke up to come here, and the cemeteries in Sunnydale are not small! Buffy shouts up to Sofia to look for an african style mask with glowing eyes and they split up to search the house. Buffy's mom is freaking out about what's going on while they search.
[ ]Explain that it's undead
[ ]Placate her and let Sunnydale blindness do its job
[ ]Write-in