Use the data function as is done by jQuery internally.
On previous versions, you could call it like for other data :
obj.data('events');
In jQuery 1.8, this direct access was removed, so in recent versions you must call it like this :
$._data(obj[0], "events")
You can see it in action by opening the console in this fiddle : http://jsfiddle.net/8TpeP/2/