Nicolas Flamel: Grindelwald rallies at the cemetery tonight, and there will be death.
I am trying to understand what "rally" means in this context.
It's a new word to me, so I looked it up in the dictionary and found out that it could mean either "to conduct a large meeting" or "to recover and become stronger".
Both options might fit into the plot, so the sentence is very ambiguous to me.
The thing I am trying to grasp is whether Nicolas Flamel knew the upcoming event would strengthen Grindelwald or he just reported that the meeting is about to take place.