While Aamir Khan has had a series of releases during
Christmas, Shah Rukh Khan is known to release his films during the festive period of Diwali.

When Aamir heard of these rumours, the actor just
laughed them off. When we asked Aamir for a reaction, he denied the allegation, saying, "It's totally untrue. In the past, too, a lot of my trailers have been launched on Diwali — whether it was Taare Zameen Par (2007), Ghajini (2008) or 3 Idiots (2009). Even when Raju (Rajkumar Hirani; director) and I discussed it (the theatrical trailer's launch date), we zeroed down on this festive launch."

"Coincidently my films have been releasing during
Christmas and each year, I have been showing the
trailer during Diwali. So, we decided to do the same
this Diwali as well. I hope the film works for us,"
Aamir told reporters here during the teaser launch of
"PK".

click
https://www.youtube.com/watch?v=KXsa5-d3f_g to watch the trailer