Question 206: Is it permissible to attend celebrations that involve Bidd‘ahs (innovations in religion), like celebrating the Mawlid (the Prophet’s birthday), the night of Mi‘raaj (Ascension to Heaven), and the night of mid-Sha‘baan, especially if the person believes that they are not permissible and intends to explain the truth for people?
Answer: Firstly, celebrating these days is not permissible. In fact, it is a condemned Bidd‘ah (innovation in religion).
Secondly, it is permissible to attend these celebrations only to object to them, explain the truth about them to other people, and instruct them that celebrating such events are Bidd‘ahs, which are not permissible to be done, especially if the person has good rhetorical skills and is unlikely to be influenced by their views. As to attending these celebrations for watching, having fun, or out of curiosity, it is not permissible. It involves partaking in Munkar (that which is unacceptable or disapproved of by Islaamic law). It also increases the numbers of people participating in such Bidd‘ahs, and thus propagates them... read more here.