JQuery $.each() JSON array object iteration
Assign the second variable for the $.each function() as well, makes it lot easier as it'll provide you the data (so you won't have to work with the indicies).
$.each(json, function(arrayID,group) { console.log('<a href="'+group.GROUP_ID+'">'); $.each(group.EVENTS, function(eventID,eventData) { console.log('<p>'+eventData.SHORT_DESC+'</p>'); });});Should print out everything you were trying in your question.
http://jsfiddle.net/niklasvh/hZsQS/
edit renamed the variables to make it bit easier to understand what is what.