Shaykh Ibn Uthaymeen (rahimahullaah) was asked:
What is the ruling on specifying the two Eeds and the day of Jumu'ah for visting the graves?
And from the Shaykh's answer:
This has no basis, for specifying the day of Eed for visiting the graves and believing this is legislated is considered to be from the innovations because this has not been related from the Prophet (sallallaahu alayhi wasallam), and I do not know of any of the people of knowledge who have spoken with this. As for the day of Jumu'ah, some of the people of knowledge have mentioned it is desirable that the visitation (to the grave) be on the day of Jumu'ah, but alongside that they never mentioned any narration from the Messenger of Allaah (sallallaahu alayhi wasallam) [as proof]. Seventy Questions on The Rulings of funerals of Ibn Uthaymeen, through al-Bida' wal-Muhdathaat Wa Maa Laa Asla Lahaa, p. 297.