What is the ruling on people gathering on a night of the week for the night prayer in congregation, followed by the witr?

The questioner : Yes. Shaykh, may Allah bless you. Regarding the voluntary prayer, sometimes it is prayed in congregation. What is your opinion about a group that designates a specific day of the week? A group that designates a weekly day? Yes, they come after the 'Isha' prayer, then they pray four rak'ahs, then they pray the witr in the manner of the tarawih prayer, and they make du'a and...

The Shaykh : Did you understand? This is wrong. This is a bid'ah (religious innovation). Designating this congregation for a specific night is an innovation. And they have made this a principle for themselves: whoever designates something regarding time, place, number, or form without evidence is an innovator.