The multiselect.redraw() method refreshes the event highlighting for the current multi-selection in the monthly calendar.
DayPilot.Month.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 batch of DayPilot.Month.multiselect.add() and DayPilot.Month.multiselect.remove() operations that postpone the redraw until the end.
dpm.multiselect.add(e1, true);
dpm.multiselect.add(e2, true);
dpm.multiselect.remove(e3, true);
dpm.multiselect.redraw();DayPilot.Month.multiselect.add()
DayPilot.Month.multiselect.remove()
Event Selecting [doc.daypilot.org]