Kacey postponed her concert all the way to 10 December, which is the same date as Niall Horan's concert. I've got both tickets and since hers is the one that was changed, I could only get a refund for that one, although I'd rather see Kacey then see Niall.
But do you know if Kacey is usually on time for her shows?
The start time is 8pm, in a concert hall/theatre. It doesn't look like she has an opening act. Usually that means being fairly on time. Niall's in an arena, and since he had an opening act last time (Maren Morris), he might have one this time too. If memory serves me right, the ticket time was 8pm, and he began performing around 9.15pm. This time, his show time is 8.30pm. It takes around 40 minutes to travel between the two places. I don't mind too much leaving Kacey's early and getting to Niall's late. What do you think? Is it doable?