Is it permissible to supplicate aloud in mosques on the night of the 15th of Sha'ban, and what is its validity?
Answer:
No, it is not permissible. There are no authentic hadiths regarding the night of the 15th of Sha'ban; all the narrations related to it are either fabricated or weak. And therefore, this night has no special significance in terms of recitation, no special prayer, nor congregation. And what some scholars have claimed that it holds special merit, but this view is weak. The narrations about it are weak and not authentic. Thus, the night of the 15th of Sha'ban should not be singled out for any special acts of worship—this is the correct view.
البدع_والمحدثات
https://binbaz.org.sa/fatwas/2453/%D8%
https://t.me/kkews001