BTW: Another workaround would be to fetch the notification that is distributed by calendar:

	broadcastEvents: function () {
		var eventList = [];
		for (var url in this.calendarData) {
			var calendar = this.calendarData[url];
			for (var e in calendar) {
				var event = cloneObject(calendar[e]);
				event.symbol = this.symbolsForUrl(url);
				event.calendarName = this.calendarNameForUrl(url);
				event.color = this.colorForUrl(url);
				delete event.url;
				eventList.push(event);
			}
		}

		eventList.sort(function(a,b) {
			return a.startDate - b.startDate;
		});

		this.sendNotification("CALENDAR_EVENTS", eventList);

	}

calendar could do the conversion work for the trash module, and the trash module could just fetch and filter the events for trash-related ones.