An unveiling — sometimes called a headstone unveiling or dedication — is held once a permanent memorial is in place, commonly between six and twelve months after the burial. Ground needs time to settle and stone takes time to make, so the wait is normal.
What happens
The stone is usually covered with a cloth or flag. People gather, someone welcomes them, there are readings or memories, and then the covering is removed by family — often children or grandchildren. Flowers are placed, and the group frequently goes on to share food.
It is a gentler occasion than the funeral. By then people can tell stories without breaking, and the ceremony often becomes as much a reunion as a remembrance.
If you'd like help
Unveilings are short and easily led by a family member. Some families prefer a celebrant so that everyone present can simply be there, which I am glad to do.