There is no information available on Nintendo holding another Secret Key event in the future.
You have to use an Action replay and add the Azure Flute to your key items. There should be a Nintendo Event from 2009-2010. Otherwise it's impossible to obtain.
yes it seems that every January 12th there is a event in Pokemon because it one of the creators birthday. the event is that in Snowpoint city it will have diamond dust snow instead of regular snow
in 2010
In Japan in December 2010
look on Pokemon news sites and most of them will reveal upcomming events announced by Nintendo
I think it is going to be a Mew.
an event at Gamestop a 15 day event
The only way to get the Azure Flute is through an event, or by hacking it. Nintendo has not yet organised an event to obtain the Azure Flute, as of the 15th of April, 2010.
12th Pokemon movie in 2010
You can get pikachu-coloured pichu between March 5th 2010 and March 25th 2010.(wifi event)You can get a jirachi right now at gamestop it started Feb. 27 and lasts until March 13
Well, through May 5, 2010 the Pokewalker Route, Yellow Forest will be available via Wi-fi event. To get this, turn on Soul Silver and go on Mystery Gift. Then click "Get Via Nintendo WFC" Then... well it'll tell you the rest. Hope I helped!