September 1, 2011 – Ganesh Chaturthi – Ganeshotsav
September 2 – Rishi Panchami
September 3 – Muruga Sashti Fasting
September 4 – Bhanu Saptami
September 5 – Radha Ashtami
September 5 – 16 day Mahalakhmi Vrat in North India
September 8 – Ekadasi Vrat
September 8 – Dol Gyaras
September 9 – Thiruonam in Kerala
September 9 – Pradosh Vrat
September 9 – Vaman Dwadasi
September 11 – Ananda Chaturdasi Vrat
September 11 - Ganeshotsav ends
September 11 – Purnima Vrat
September 12 – Purnima or full moon day
September 12 – Mahalsya Shradh begins with Purnima Shradh
September 13 – Pitru Paksha Shradh
September 13 – Ashunya Shayan Vrat
September 13 – Ashwin month begins in traditional Hindu calendar in North India.
September 16 – Sankashti Ganesh Chaturthi Vrat
September 17 – Bishwakarma Puja
September 17 – Kanni Masam begins in Malayalam Calendar in Kerala
September 18 – Puratasi month begins in Tamil Calendars
September 19 – Aashin month begins in Bengali Calendars
September 20 – 16-day Mahalakshmi Vrat ends
September 20 – Jivitputrika – Jitiya Fasting
September 21 – Matru Navami
September 23 – Indira Ekadasi
September 25 – Pradosh Vrat
September 27 – Mahalya Shradh
September 27 – Amavasya – No moon day
September 28 – Navratri begins – Ghata Sthapana
September 28 – Ashwin month begins in Calendars followed in Andhra Pradesh, Karnataka, Maharashtra, Goa and Gujarat<
September 30 – Sindhoor Tritiya