I am saying this as a former believer (and holding no grudge), definitely aware of the fine line between sharing and pushing cultural items, and balancing the two rather equally in a diverse team.
EDIT: actually, it's a topic in itself in a matter of company/team management. I saw a similar concern grow in one of my older team in a previous job, because the company "inclusion and diversity" department held a _very_ unbalanced and awkward take in this regard, talking a lot about some religious/cultural items, and ignoring quite a few others (from different equally present countries of origin and faiths), actually resulting in a fracture in the self-perceived image of the team. That's really a delicate matter.
The occasional celebratory post is fine on HN. If it were to become repetitive, it would get tedious quickly and we would downweight such posts in keeping with standard practice (see [1] and [2] about that).
[1] https://hn.algolia.com/?dateRange=all&page=0&prefix=false&so...
[2] https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
Don't know if that is possible of course. I think the HN readership would welcome a way to use a post to explore cultural aspects, ask respectful questions, etc, but dont need a slurry of one line celebrations.