The ruling on celebrating the middle night of Sha'baan+other related fatwas

As salamu alykum wa rahmatul-llahi wa barakaatuhu, 

How reliable are the hadiths on the merits of the middle night of Sha'baan: 

http://www.alifta.net/Fatawa/FatawaChapters.aspx?View=Page&PageID=17&PageNo=1&BookID=10 

Is it permissible to celebrate the middle night of Sha'baan: 

http://www.alifta.net/Fatawa/FatawaChapters.aspx?View=Page&PageID=13&PageNo=1&BookID=10 

Is the middle night of Sha'baan the night meant in Suratudh-Dhukhaan: 

http://www.alifta.net/Fatawa/FatawaChapters.aspx?View=Page&PageID=11&PageNo=1&BookID=10 

Was the Qur'aan sent down on the middle night of Sha'baan: 

http://www.alifta.net/Fatawa/FatawaChapters.aspx?View=Page&PageID=20&PageNo=1&BookID=10 

Ruling on attending celebration of middle night of Sha'baan: 

http://www.alifta.net/Fatawa/FatawaChapters.aspx?View=Page&PageID=18&PageNo=1&BookID=10