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angular.module('eventExampleApp', []).
  controller('EventController', ['$scope', function($scope) {
    /*
     * expose the event object to the scope
     */
    $scope.clickMe = function(clickEvent) {
      $scope.clickEvent = simpleKeys(clickEvent);
      console.log(clickEvent);
    };

    /*
     * return a copy of an object with only non-object keys
     * we need this to avoid circular references
     */
    function simpleKeys (original) {
      return Object.keys(original).reduce(function (obj, key) {
        obj[key] = typeof original[key] === 'object' ? '{ ... }' : original[key];
        return obj;
      }, {});
    }
  }]);

<div ng-app="eventExampleApp">
    <div ng-controller="EventController">
      <button ng-click="clickMe($event)">Event</button>
      <p><code>$event</code>: <pre> {{$event | json}}</pre></p>
      <p><code>clickEvent</code>: <pre>{{clickEvent | json}}</pre></p>
    </div>
</div>