Halloween Bingo...Head Start

Circe - Madeline Miller

So, since I haven't started Circe, yet, does that mean I can use this as my first bingo book?


I don't know which squares this would cover but since it is about Circe, my guess would be that Spellbound would be one of them. 


Do I have to decide now or can I allocate a square once I figure out what the book is about?