The fifteenth night of Islamic calendar month i.e. Sha’bān is commonly referred to as Shabbe Barā-ah or Lailat al-Barā-ah, which means the night in which Allāh’s decision of forgiveness is passed.
مفتی مولانا تقی عثمانی کا ٥ا شعبان کی فضیلت پر جامع خطاب
Ijtehad by scholars, if is correct, gets two Sawab, but if its in error then he gets one Sawab due to sincere noble intentions. Common Muslims follow scholars, if scholars differ, its between them and Allah. Every Muslim cannot become scholar. In Salah some people say Ameen loudly some quietly both are right, why create fuss?
But in this case there is no Shirk, no idol worship, no fundamental of Islam being violated. We should keep it optional and seek blessings from Allah. Concentrate of core issues of Eyman, good deeds. Allah Knows the Best. Read more: http://islam4humanite.blogspot.com/2016/05/wasting-effort-in-minor-fiqh-issues.html
The Muhaddithīn (experts in Hadīth sciences) spent their lives in ensuring that the Ummah receives reliable Ahādīth (narrations) of Prophet Muhammadﷺ. They scrutinized the various dimensions of each Hadīth and gave a ruling on the strength and reliability of the Hadīth. The Ahādīth that extol the merits of the fifteenth night of Sha’bān are so many that it is impossible for one to deny. Even though these Ahādīth are not so strong on an individual capacity, yet the combination of all these Ahādīth together proves the virtues of this night. Consider the following Ahādīth:
Imām Tabrāni has recorded this Hadith in his Awsat and Kabīr, and Ibn Hibbān in his Sahih. And Allāmah Haithamī has mentioned in Majma’ az-Zawāid that the narrators are authentic.
Imām Ahmad narrates this Hadīth with a slight weakness in the chain. Allāmah Haithamī states that all the narrators are authentic except for Ibn Lahīa’h.
Hadhrat A‘isha (R.A) says, “I woke up one night and did not find The Messenger of Allahﷺ. I went outside and found him in Baqī’. He said to me, "Did you fear that Allah and His Messenger would oppress you?”. I replied, "0 the Messenger of Allahﷺ, I thought that you had gone to meet the other wives." He then said to me, “Allah does Nuzūl to the nearest sky on the fifteenth night of Sha‘bān and He forgives more people than the number of hair on the goats of the Banu Kalb tribe. (Sunan at-Tirmidhī)
The combination of all these Ahādīth proves the merit of this night. Allāh forgives the sins of many servants on this night. Also, Allāh’s special Mercy and Forgiveness descends from the beginning of the night till dawn and prayers are accepted on this night.  Hence, one should spend this night in the worship of Allāh Ta‘ālā. However, one should bear in mind that there is no specific form of worship or Salāh that is specific to this night. Hence Nawafil, Zikr, reciting Quran will earn high rewards from Allah.
Fasting on the fifteenth of Sha‘bān is not proven through any authentic narration. The Hadīth in which fasting on this day is mentioned is extremely weak. Hence, the fasting on the fifteenth of Sha‘bān is not a Sunnah.  However,one may keep Nafl fast on that day since it is reported in Sahīh al-Bukhārī that Rasūlullāh Sallallāhu Alaihi Wa Sallam would fast excessively in the month of Sha’bān. The Hadīth is as follows:
Aishah Radhiyallāhu Anhā states, “I have never seen The Messenger of Allahﷺ fasting in any other month (besides Ramadhān) more than his fasting in Sha’bān. (Sahīh al-Bukhārī)
In the Ahādīth it is mentioned that The Messenger of Allahﷺ visited the graveyard on this night. However, from another authentic Hadīth, it is proven that The Messenger of Allahﷺ would visit Baqī‘ every night he spent at the home of Aishah Radhiyallāhu Anhā, which was once every week. Hence, visiting the graveyard is not a special characteristic of this night. Instead, it is a Sunnah to visit the graveyard at least once every week.  And Allah Knows Best,
For further details, you may refer to “SHABE BARAAT”, a book written on the topic by Sheikh al-Hadīth Moulānā Fazlur Rahman Azmi. The book may be downloaded from the following link:
From ... Abdul Azīm bin Abdur Rahman,Student Darul Iftaa U.S.A.
 SHABE BARAAT (MOLANA FAZLUR RAHMAN ‘AZMI), PG. 16
 SHABE BARAAT (MOLANA FAZLUR RAHMAN ‘AZMI), PG. 23-24
 حدثنا يحيى بن يحيى التميمي، ويحيى بن أيوب، وقتيبة بن سعيد - قال يحيى بن يحيى: أخبرنا، وقال الآخران: - حدثنا إسماعيل بن جعفر، عن شريك وهو ابن أبي نمر، عن عطاء بن يسار، عن عائشة، أنها قالت: كان رسول الله صلى الله عليه وسلم - كلما كان ليلتها من رسول الله صلى الله عليه وسلم - يخرج من آخر الليل إلى البقيع، فيقول: «السلام عليكم دار قوم مؤمنين، وأتاكم ما توعدون غدا، مؤجلون، وإنا، إن شاء الله، بكم لاحقون، اللهم، اغفر لأهل بقيع الغرقد (صحيح مسلم، ج 2، ص 669، دار إحياء التراث العربي – بيروت)
 SHABE BARAAT (MOLANA FAZLUR RAHMAN ‘AZMI), PG. 19-20
Differentiate between good and bad bid’ah