Ruling on the attendance of da'wah workers at gatherings that contravene the Shari'ah for the purpose of calling them to Islam

A message has reached the program from one of the brothers, (S. A. A.) from Sudan. Our brother says: In Sudan, when a person dies, the people gather after the burial. The question is: Is it permissible for the da'wah worker to go to them and call them to Islam and rebuke them for this action? This da'wah worker goes with the intention of calling to Allah, clarifying the truth from falsehood. He does not sit with them or eat with them; rather, his purpose is to convey the call of Allah because they are gathered, and then he leaves without sitting with them. I ask this because some of the brothers do not see going with the intention of da'wah, as they are in a state of munkar (evil). I hope for a detailed clarification. May Allah reward you with good?
Answer: The going of da'wah workers to gatherings that contravene the Shari'ah for the purpose of da'wah and guidance is a required matter; because it is an opportunity that should be utilized. The Prophet (peace and blessings be upon him) would pass by the gatherings of the disbelievers in Mina and call them to Allah, asking them to provide him with protection so that he could convey the messages of Allah. He once went to Sa'd ibn Ubadah to visit him in Madinah while he was sick, and he passed by a gathering that included Jews, some disbelievers from among the polytheists, and some Muslims. He stopped with them and called them to Allah (Glorified and Exalted is He) and encouraged them to do good. So, if da'wah workers visit some deviant gatherings, such as those who gather after the death of a person and hold a mourning ceremony at the home of the deceased, he teaches them: This is what is permissible. The family of the deceased does not hold a feast for the people, nor food, nor gather the people. But if their neighbors or relatives send them food, there is no harm in this, as the Prophet (peace and blessings be upon him) did when the news of the death of his cousin Ja'far ibn Abi Talib at Mu'tah reached him. He ordered his family to send food to the people of Ja'far and said: . This is not only permissible but prescribed. As for the family of the deceased holding a mourning ceremony, preparing food for the people, and gathering them, this is not permissible; this is from the practices of the pre-Islamic age of ignorance.
Likewise, gatherings for the Mawlid, such as celebrating the Mawlid in any place, the da'wah workers come to them and say: This celebration is not permissible. There are no Mawlid celebrations in the Shari'ah. The Prophet (peace and blessings be upon him) did not prescribe this, neither for his own birth nor for the birth of anyone else. The Rightly Guided Caliphs did not do it with their Prophet (peace and blessings be upon him), nor did the rest of the Companions, nor the Tabi'un, nor those who followed them with excellence, until people become aware of these religious innovations and beware of them. All of this is fine. The only evil is to attend with them merely to participate. But if he attends not to participate, but for da'wah, guidance, and direction, and then leaves, he is rewarded and not blamed. And Allah is the One to be sought for help. Yes.
The presenter: May Allah reward you.