Answer:
(Fatwa: 708/708/M=1431)
How and why does Saifi caste celebrate “Saifi Day”, we do not know the detail. However, in Islam there are only two days of festivity i.e. Eidul Fitr and Eidul Azha, instead of these two days celebrating any other day is not proved. Celebrating someone’s birthday is wrong as well.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
