Get the position of each alphabet - A=1, B=2, C=2 ... Z= 26
So
DEEPAWALI = Sum of Positions of each alphabet = 4+5+5+16+1+23+1+12+9 = 76
DURGAPUJA = Sum of Positions of each alphabet = 764+21+18+7+1+16+21+10+1 = 99
Similarly
RAKSHABANDHAN = Sum of Positions of each alphabet = 18+1+11+19+8+1+2+1+14+4+8+1+14 = 102
Answer: 102