Final answer:
The spell prevented celebrations from being celebrated in Narnia by targeting witches and hindering their participation.
Step-by-step explanation:
The spell prevented celebrations from being celebrated in Narnia.
The passage mentioned that witches were not able to recite the Lord's Prayer perfectly, which suggests that the spell prevented them from participating in celebrations. Since witches were associated with magic and the dark arts, the spell likely targeted them specifically.
To further support this, the passage also mentions the fear of dark and inescapable haunts of the magic arts and the belief that witches would snatch bodies before they could be buried. This indicates that celebrations were hindered due to the presence of witches and their disruptive actions.