It is not prescribed to spend laylat a-nisf min Sha’ban in prayer or to fast on this day, or to single it out for certain acts of worship.

Fasting in Sha’ban in the second half is not allowed and that is either makruh or haram, except for the one who has the habit of fasting regularly or who is continuing after fasting during the first half of Sha’ban. For more, see the detailed answer.

What is narrated about praying, fasting and worshipping on the 15th of Sha’ban is fabricated. So it is not permissible to follow such hadiths or to act upon them, whether that is in doing righteous deeds or otherwise. For more, please see the detailed answer.

There is no sahih hadith concerning the virtue of the night of the fifteenth of Sha’ban.
With regard to Allah’s descending on the 15th night of Sha’ban, there are hadith which are weak, but the reports that He descends every night are proven and sahih, so the night of the fifteenth of Sha’ban is included in that. For more, please see the detailed answer.

There is nothing wrong with making up a missed Ramadan fast in the last half of Sha’ban.

Celebrating the 15th of Sha’ban is not permissible whether that is by spending the night in prayer, dhikr and reading Quran, or by distributing sweets or giving food to people and so on. For more, please see the detailed answer.

Shab e Barat is a bid`ah and there is no celebration in Sha’ban and there is no special act of worship to be performed in mid-Sha’ban or during the last days of the month. For more, please see the detailed answer.