Technical rehearsal.The very special guest star is Sarah Michele Gellar. Nobody checked to see if any of the rent-a-crowd horror muppets were vampires until after the final act had been choreographed. Sweetums has had a fog machine piped into his shirt, someone has figured out how to get the spiders to skate, and the ice rink has been completely refurbished; but there are no vampires to be slain. So now everyone Sarah stakes will have a set of fangs added to their costume, which it turns out is not a great problem. But it shouldn't have happened this way.
Pigs in Space have realized they can't pretend they don't know about lighting plans if they want to have different lighting when the alien attacks. Better late than never.