Calendar : change a data when dragging a event

I use the plugin calendar :

  • when I dragg an event with the autobinding it’s ok the date is changing.
    I’ve another data who depends of the first one and isn’t change when i dragg and drop event on the calendar…
    How can i automaticaly change the 2nd data when the first is changed ?
    Thanks for your answer

I am also needing a solution to this. Is there a way to add a calendar workflow When Calendar’s event is dragged?