I came here with this exact same question.
Specifically, I want to add the date of the event and venue name to that pop-up. It’s a little silly that you can see the address but not the venue name (Quick! Off the top of your head, give me the address of the last pub you went to!).
I understand you say it’s in a script – where is this script? How can we modify it? If you could at least point me in the right direction, I’m not afraid to break some things in the spirit of learning.