Navaratri is celebrated all over India in different ways in each region. The tenth day is celebrated as Dassara, or Vijaya Dasami (Victory Day). It is remebered as the day the Divine Mother achieved a great victory over the demons, and also the day Rama defeated the demon Ravana in the great epic the Ramayana. This is also Baba's Mahasamadhi Day, so it is especially auspicious for Sai Devotees tto defeat their own inner demons. Victory Day is Monday, September 28 this year.
Some devotees will fast during the nine days, either abstaining from food entirely, or not eating a favorite food such as rice, only eating in the evening, only eating fruit, etc. Fasting = austerity which means more control over the senses -- reducing their grip on the mind. Fasting also demonstrates sincerity to God and draws the sympathy of the Divine Mother. Fasting is not necessary but enjoyed by some.
God is neither male nor female. But to give God form, we worship Him/Her as male or female. Both Mother and Father love the child. But Mother expresses her love in the most tender way, and child feels most intimate with Mother. In same way, worship of the Divine Mother brings the most tender emotions of love which makes us intimate with God.
During the first three days of Navaratri, the Divine Mother is worshipped as Durga.
Durga is the most fierce form of the Divine Mother. She is seen riding a lion or tiger. Riding a tiger means she can tame the fiercest passions. She carries many weapons. This means she is well equipped to rip out even our most evil tendencies and bad associations. Durga worship will solve family problems and remove evil associations from our life.
During the second three days, the Divine Mother is worshipped as Mahalakshmi. During the last three days, the Divine Mother is worshipped as Saraswati.

AUM DUNG DURGAYE NAMAHA AUM