Lulu is worldwide and it would be impossible to include everything on the calenders.
Myself and my friend combined know everything there is to know, but he's not here.
Those holidays are commonly displayed on practically every calendar I've ever seen as they are celebrated world wide. I'd contact support.
I have noticed that my birthday is significantly missing.
I would suggest those days are only celebrated worldwide by Christians, a religion vastly outnumbered by others.
It's annoying it does not include Lughnasadh.