Only rituals I can think of would be to still celebrate her birthday. To include her in all occasions, Christmas, Easter,Halloween. We even include her for carnival celebrations.
We always eat cake on her birthday,and go for lunch,we try and buy her something too. Her anniversary we try and visit the beach,but that’s the more difficult date, one I still cannot cope with particularly well.
We’d like to visit places on her birthday,but as it’s February and usually cold,(apart from the year she was born), we tend just to do lunch. She always has daffodils. And finances dependent, we try and give £35 to charity or buy something for the children.
We also try and get people to write her name,which I shared in Heart work.