The following are some of the days considered auspicious according to the Hindu calendar for gold purchases in India:

Oct 12 Mon Pushya Nakshatra Day for new ventures

Oct 15 Thurs Dhanteras Gold for prosperity

Oct 17 Sat Deepavali Festival of lights

Nov 9 Mon Pushya Nakshatra Day for new ventures

Dec 6 Sun Pushya Nakshatra Day for new ventures.

The biggest gold buying festivals are Akshaya Tritiya and Dhanteras.
The Hindu calendar has regional variations, but the above dates are broadly followed across the country in the gold trade for planning inventories.