Everypony thought Pinkie was just being her usual, bizarre self. When she started acting strange while talking about a new friend she had made, they just chalked it up to "Pinkie being Pinkie."
They shouldn't have assumed that.
Contains: Lovecraftian elements, demonic summoning, ignoring potential dangers, and Pinkie not knowing what she's doing
Meanwhile Luna and Celestia are looking out their window and sighing what a mess their regalia is going to after this affair while twilight will end up cleaning up the mess afterwards.
Well, THIS is going to be an interesting adventure.