Last year, I went to BOM for the first time during Diwali. I can remember all the firecrackers from the time when we still had a southerly heading over Navi Mumbai (LH756, FRA-BOM) until touchdown.
This year, I was already on the ground during Diwali. On sunday night, we had dinner on the roof-top of the Orchid Hotel - and we were again amazed by the fireworks around the airport, including the approach sector.
I guess nobody´ll change the habit of the Indians in this respect...
Cheers,
J.V.