Maybell, does he attend child events? I don't ask, I just state facts to H which I think are seen as opportunities.
For example, I'll text him, "D's karate tournament is November 9th in Irvine. She is sparing and performing her form. She also wants to watch the black belt sparing and forms so we'll be there all day. Are you coming?"
Done.
If he comes, great. If he doesn't, she'll be hurt but I can't make it happen.