Is there a special fast or worship on the 15th of Sha'baan?

“It is Mustahab to fast on the 15th of Shabaan. The fast of the 15th is proven from the Ahadith even though the Hadith may be categorized as a weak narration. It is permissible to act on a weak narration on the basis of attaining the virtue (Fadhaail) mentioned therein, as long as it is not regarded as Sunnat.”

“One may fast on the 15th of Shabaan, however it is not necessary. The hadith in reference is supported by other Ahadith and could be considered for purpsoses of virtue based on the principles of hadith.”

“The fast of the 15th of Shabaan is based on a tradition reported by Sayiddna Ali. Its text runs as follows : When the Middle Night of Shabaan arrives, you should stand (Praying) in the night and should fast in the day following it.”

“The fast of the 15th of Shabaan is based on a tradition reported by Sayiddna Ali. Its text runs as follows : When the Middle Night of Shabaan arrives, you should stand (Praying) in the night and should fast in the day following it.This Hadith is recorded by Ibn Majah in his Sunan, one of the famous six books of Hadith, and also …”