The Goddess has opened her eyes. The time of festivities have started. Mahalaya is the first day of Devipaksha, the fortnight of the Goddess Durga.
Goddess Durga has slain demon mahishasur after a ten day war, in spring, but when Ramchandra was about to fight a war against Ravana he prayed to the Mother Goddess for victory in autumn. That is why this puja is called Akalbodhan, untimely awakening.
From 30th september will start the Durgapuja in traditional altars, where the puja is done in traditional way, in the fun loving pandals the puja will start on 1st october.
May all the blessings of the Mother Goddess shower down upon you and your world.