Set your alarms at 4 am and tune into Mahishasur Mandini, because it's time to celebrate Maa Durga's arrival! Being celebrated this year on September 25, Mahalaya marks the end of Pitru Paksha and the beginning of Devi Paksha. Devotees celebrate this occasion a week before Durga Puja by listening to popular hymns and bracing themselves for the forthcoming festivities. Here's everything to know.