I am sorry that the virtual gathering you set up did not go the way you wanted. When it comes to getting people to be present at a gathering it’s actually typical that some don’t show up. This is something I have seen people experience quite a bit over my years of providing entertainment.

Some people fall short and there is not much you can say to change that. Basically this speaks out about them not you. It’s often a waste to expect a genuine regret because if the person had that in them in the first place they would have spoken up sooner. And if you force it chances are you will end up getting some gaslighting type response that only adds more insult.