Bismihi ta'ala
In the sunnah of Islam, mourning of a deceased is for three days only. The only exclusive exemption is Imam Husain (a.s.), and the important event of 'Arbaeen.
Yes, there are cultural practices, for Fatiha ceremonies, like the 7th day, 40th day, and one year passing of the deceased, but these are just customary traditions.
And Allah knows best.