Non Jews probably don't get this. but the truth is that Jew hating which is always with us, has spiked up dramatically recently and that of course includes Jews who aren't Israeli, don't relate to Israel, and don't live in Israel.
As a result Jews throughout the world are more and more voluntarily trying to make themselves less visible in order to avoid being attacked.
That's not always possible if your last name is Goldberg or you look like Woody Allen.
So it is common for men who would normally want to wear a kippah to choose not to out of fear. In other words, to HIDE.
That is very sad that so many Jews feel the need to do that but that's the way it is.
But if you're meeting on the topic of religious tolerance, it seems to me that would not be the time to hide your religious and ethnic identity.