Yes, our women's group at work never has breakfast meetings for precisely that reason.
We have various diversity initiatives, and they take place in business hours,. Usually, they're also recorded, because we're a global company and business hours in Frankfurt or London aren't the same as east coast USA or Colorado or Sydney or wherever. Lots of webinars get scheduled at least twice for that reason, so there's an EU/USA overlap and an AsiaPac/USA overlap.
I would point it out to them, but then I seem to have a reputation for asking saw ward questions, so doing as I do may not always be best. (The last time I asked one, someone said after, "that was brave! " and I hadn't thought it brave at all, I was just interested to know, and they totally avoided answering the actual question anyway.)
If they're still getting used to the idea of diversity, it may help to point out that while it is mostly women who do the same hooligans run (er, that's what my phone has auto-corrected school run to...) point out fathers do, too, and they can support their wives by doing it more often in many cases.