Asking Friend for Ticket Back

[Buffybee]

Myself and friend, who like this particular style of music, booked tickets ages ago for a Show, which is in two weeks.
A week ago, she tells me that her Dh is working away that evening and she can't find any childcare. She's gutted and I even try to sort some childcare out with a family member, but anyway it wasn't possible.
So, she says to find another friend to go to the Show with me.

I ask another friend and even though it's not exactly her thing, she agreed to come with me.
Now original friends Dh has told her the business trip is cancelled and she's pissed off as she's no ticket now. She let the ticket go for free.
Do you think it would be ok for me to explain to the friend who's coming with me the change in situation and ask if she'd mind giving the ticket back?
Or just leave it now?
Really don't know what to do!

I think if i were friend 2 i would want to know if i had been given the ticket and friend 1 could now go.
Assuming you are all british, friend 2 might have something else to do but too polite to wriggle out of the evening

If the music is something that friend 2 isn’t massively into and they are just going to keep you company then i’d say to them. They might be relieved to be off the hook to be honest.

If I was stand-in friend, I'd be happy for the other friend to go instead of me. I wouldn't be offended or upset, especially if it's something I've no real interest in.

But you know your friend. Maybe mention the other friend is available to go again and offer her a "get-out clause"?

Friend 2 and I have Shows and holidays booked right the way through to February 2019
We will probably squeeze a few more in as well.
She also has lots of other friends whom she socialises, although I would see myself as one of her best friends.
I am also, one of friend 1's best friends. She and her Dh socialise with other couples mainly but I would be invited to, say, a Bbq at their home.
They both have other friends with whom they socialise.
I would not unnecessarily be invited to every occasion by either of them.