What is the ruling on agreeing on a specific day for charity, fasting, or the funeral prayer?

Question:
He says: Honorable Shaykh, may Allah grant you success. Some young men designate a specific day on which they fast, give charity, and pray over a funeral. They go to the cemetery and bury that funeral, then they go to visit a sick person. They call this the project of Abu Bakr al-Siddiq. Is this from cooperation in righteousness and piety?

Answer:
And they designate it for a day, and they gather it all in one day. This is all from bid'ah (religious innovations). May Allah guide the young men. They have started inventing things and saying that they are prescribed, while they deny the sunnah (recommended practice). They deny the sunnah, they deny the tarawih (the Ramadan night prayer), and they deny things from the sunnah, while they innovate. And no one contradicts their bid'ah. We ask Allah for safety. It is obligatory for them to leave these matters.
They visit the sick person, attend the funeral, pray over it, and give charity, but not on one day or a specific day, and they do not agree on this.
Each person does this on his own; they do not gather for it or agree upon it. All of these are bid'ah (religious innovations) and newly invented matters. Yes. They are burdens . Yes.