Shab-e-barat 15th Shaban

Mid-Sha'ban is the 15th day of the eighth month (Sha'ban) of the
Islamic lunar calendar. The preceding night is known as Laylatul
Bara’ah or Laylatun Nisfe min Sha’ban in the Arab world, and as
Shab-e-barat  in Afghanistan, Bangladesh, Pakistan,
Iran and Muslim parts of India. These names are translated
to the night of records, the night of assignment and the night of
deliverance, and the observance involves a festive nightlong
vigil with prayers. In some regions, this is also a night when
one's deceased ancestors are commemorated.

Sunnis observe mid-Sha'ban as a night of worship and salvation.
Various ahadith have been transmitted in this regard, some
weak and others graded hasan or sahih. Scholars including
Al-Shafi‘i, Al-Nawawi, Al-Ghazali and Al-Suyuti have declared
praying on the night of mid-Sha'ban as acceptable.
In his Majmu`, Al-Nawawi quoted Al-Shafi`i saying that there are
5 nights when dua (prayer) is answered, one of them being the
night of the 15th of Sha`ban.
There are many other narrations from Sahaba and early Muslims
confirming this matter, as mentioned by Ibn Rajab al-Hanbali in
his Lataif al-Ma`arif, amongst others.
About hadith
On this night, Muslims perform Nawaafil, recite the Qur'an,
Salawat, Kalima Tayyibah, and seek forgiveness.
As for the other narrations concerning the 15th of Sha'baan
(which are not believed authentic), the Hanafi scholar, Shaikh
Mulla 'Alee al-Qaaree (d.1014H) records some of these hadith:
In another narration, the following people have also been
mentioned:
One who deals in usury (Riba),
One who wears his trousers below his ankle with pride and
arrogance (In Arabia, people displayed their wealth and boasted
in this manner),
One who creates disunity among two Muslims,
The person who unjustly takes away the right and property of
another Muslim and has not yet rectified himself.
All these persons do not receive mercy of Allah at all time, as
well as on this auspicious Night. A humble appeal to seek
pardon and ask Allah’s forgiveness
Also on this night the Doors of Mercy and Forgiveness are
opened wide,and those who sincerely grieve over and repent
for their past sins and seek forgiveness from Allah are
pardoned and forgiven by Allah.
Each Tasbih or Du’a should begin and terminate with the recital
of Salawat and one who wishes for the acceptance of his Du’as
should use the Wasila of Prophet Muhammad.
Shaykh Abd al-Qadir al-Gilani has mentioned in his book
”Ghunyat li Talibee Tariqil Haqq” (i.e., The Gift for the student
who seeks the path of truth) that the month of Shaban according
to some narrations is related to  Prophet Muhammad . So, it is the duty
of Muslims, as the followers of  Prophet Muhammad  to love and
respect this month more than any other month (besides
Ramadhan). Muslims should also offer abundantly salutations
uponProphet Muhammad .
Ruling
It is the special night of seeking forgiveness and repenting to
God, remembering past sins and sincerely settling the mind that
one will never commit sins in the future. All the deeds that are
against Shari’ah must be totally avoided so that our Du’a and
Istighfaar, hopefully, will be accepted.
Dr. Muhammad al-Jibaly said: The hadith indicates that this night
surely has a special merit
Even when hadiths are used to justify the night, Salafi scholars
have labeled such hadiths as weak (da'if). Day of Arafa, Laylat
al-Qadr and Day of Ashura on the other hand have much
stronger references in Quran and/or Hadith.