What if you don't make it pretty and just use this code:

{% for upcoming_book in upcoming_books %} {{ upcoming_book.book }} {{ upcoming_book.read_by }} {{ upcoming_book.description }} {% endfor %}

{% for previous_book in previous_books %} {{ previous_book.book }} {{ previous_book.read_by }} {{ previous_book.description }} {% endfor %}

Does it work?

Yes it does. GirlThatLovesToCode