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I'm accustomed to adding train and transit passes to my (Android) Google Wallet. The ticket websites and emails often have a link for doing so. Less often, I find such a link for adding passes for activities - museums, palaces, cathedrals, etc. So imagine my delight when I tried again to add those passes for my upcoming trip and figured it out!
(Follow instructions in separate post below this one)
If you don't like something about the pass you've added, you can delete and repeat, but not always edit the content of the pass. You can press and drag to resort the passes, if you don't like the default.
And for anyone with the question, I put my phone in airplane mode and turned off wifi and was still able to bring up each of my passes in Google Wallet.
I'm sure some of you have been doing this for a while. For me, I will be glad to have more (most!) of my tickets and passes in Google Wallet.