The EventMoveArgs has a property called Data, which the intellisense indicates if for custom data. I need to pass an additional parameter other than the traditional Id, NewStart and NewEnd with the Callback to OnEventMove. How can I do this?
e.Data holds custom data sent from the client side when invoking the EventMove event manually using .eventMoveCallBack().
See also: http://api.daypilot.org/daypilot-scheduler-eventmovecallback/
If you want to store custom data with the event, you should use DataTagFields to specify the db fields to be loaded and passed with the event.
See here - section 4. Custom Event Data (Tags): http://doc.daypilot.org/scheduler/event-loading/