What is the ruling on congratulating people on the day of Eid, its formula, and visiting graves on the day of Eid?

Question : In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, Lord of the worlds, and may blessings and peace be upon our Prophet Muhammad, his family, and all his Companions. Honorable Shaykh, this question has been repeated. He says: You mentioned (may Allah preserve you) what is recommended on the day of Eid, and it remains for you to clarify for us what the Sharia-compliant formula is for the Eid greeting.

Answer : It is reported from the Salaf that when a person meets his brother on the day of Eid, he says: May Allah accept from us and from you.
There is no specific formula prescribed by the Sharia for it. Rather, whatever formulas have become customary, provided they are not prohibited by the Sharia, are permissible. This is because these are ordinary matters, not religious matters; they are ordinary matters that revert to what people have accustomed to among themselves.
So if people have the custom of saying "May Allah accept from us and from you," or "We ask Allah to make your Eid blessed," or similar words that bring about affection and remove estrangement, then there is no harm in that. Because these are ordinary matters. But some people say: If we congratulate the living on the day of Eid...
...then let us congratulate the dead. So they go out to the graveyards on the day of Eid, saying: We are going to celebrate Eid with our relatives in the graveyard. This is an innovation (bid'ah), for it is not reported from the Prophet (peace and blessings be upon him) or from his Companions that they would specifically designate the day of Eid for going out to visit the graveyards. May Allah reward you.