The multiselect.redraw() method refreshes the event highlighting for the current Calendar multi-selection.
DayPilot.Calendar.multiselect.redraw()This method has no parameters.
This method updates the calendar event highlighting according to the list of selected events.
Call it after a series of DayPilot.Calendar.multiselect.add() or DayPilot.Calendar.multiselect.remove() operations that were performed with dontRedraw set to true.
dpc.multiselect.add(e1, true);
dpc.multiselect.add(e2, true);
dpc.multiselect.remove(e3, true);
dpc.multiselect.redraw();DayPilot.Calendar.multiselect.add()
DayPilot.Calendar.multiselect.remove()
Event Selecting [doc.daypilot.org]