There has been no next events for Arceus announced for 2010.
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12th Pokemon movie in 2010
Nobody knows when the next Arceus event is but I missed it because I got mine from my friend or you can get a action replay and look for the bad egg code and the egg will hatch into a shiny LV.100 Arceus.
There isn't a date for the Arceus Event in Pokemon HeartGold (unless you mean the event where you get Arceus). When you send over any Arceus into your HeartGold game, the event is activated. You'll have to go to the Ruins of Alph in order to do the event.
You can only get Arceus by an Event.
there is not going to be an event for arceus on Pokemon black sorry to disapoint you.....!