What is grave visitation etiquette in your region or country?

I haven’t lived in the UK for very long and I have been told that visiting the graves of ones beloved family now departed is very important on particular days.

Christmas as being one of the biggest days.

This day, I am told, the graveyard is full of family and flowers and forms part of the tradition of Christmas day for many, not all families.

I am surprised as where I come from Christmas day in general was not about visiting graves. Perhaps boxing day was I am not really sure.

What is your areas or countries general visitation expectations? Or better still which days are your own personal days for visitng families final resting spots?