According tho the reliable scholars of the Ahlus Sunnah, the fifteenth of Sha’ban, which is commonly referred to as “Laylatul Bara-ah” (refer: Tafsir Razi and Ruhul ma’ani, surah 44. Ayah:3) is indeed one of the significant nights in the Islamic calendar.
Ibnul Haj (rahimahullah) states:
“The salaf (pious predecessors) would sanctify this night and prepare themselves for it in advance”
(Al-Madkhal, vol.1 pg.299)
Imam ‘Ata ibn Yasar (rahimahullah) –the great Tabi’i of Madinah- said:
“After Laylatul-Qadr, there is no other night in the year that is more virtuous than the middle (15th) night of Sha’ban”
(Lataif al-Ma’arif, pg.264 & Sunan Sa’eed ibn Mansur; refer: Husnul Bayan, pg.11)
Some people, due to being ill-informed refute the auspiciousness of this occasion.
I have prepared a detailed article on this which I have posted on my blog (Al-Miftah.com) In this article you will find sufficient information on this issue insha Allah. See it here.
And Allah Ta’ala knows best,
Answered by: Moulana Muhammad Abasoomer
http://www.al-miftah.com/2012/12/15/significance-of-the-15th-of-shaban/