Adding a related sales order to the calendar event

[Guido1982]

I am in the process of relating activities directly to sales orders. I created a table that relates them and made a query in 'SaveEvent.php' that saves it, so far so good. Now I want every event to show that sales order as other related modules do. I saw that the Events.php file creates a JSON of all events, that I guess the 'fullcalendar.js' file uses to build the calendar. But now for the moment I am stumped on how to implement my query here and use it in the calendar. I think I should also edit 'CalendarView.tpl' (the jQuery to be exact), so that the JSON is expanded and the jQuery call uses this to build the calendar items. Does anyone have more detailled info?