Praise be to Allah.
Celebrating birthdays is an innovation in the religion of Allaah, and it is not permissible to do this. It is not permissible to eat the food that has been prepared for this occasion. Their claim that the food for the birthday celebration is for the guests does not make it excusable to eat it. Hospitality is subject to its own rulings, and matters are judged according to the intentions behind them. It is very clear that the food is being prepared for this innovated occasion, and eating this food is one of the things that helps them to persist in doing this. It is a kind of co-operation in sin and transgression. Allaah says (interpretation of the meaning):
“Help you one another in Al Birr and At Taqwa (virtue, righteousness and piety); but do not help one another in sin and transgression” [al-Maa’idah 5:2]
Shaykh ‘Abd al-Kareem al-Khudayr
With regard to al-salaah al-naariyah, this is one of the innovated Sufi prayers; it is not permissible to attend those gatherings or to take part in them.