Yes, you can modify the event appearance and behavior using BeforeEventRender event handler:
http://doc.daypilot.org/scheduler/event-customization/
The recurring events will have e.Recurrent property set to true. A simple example copied from the documentation:
protected void DayPilotScheduler1_BeforeEventRender(object sender, BeforeEventRenderEventArgs e)
{
// modifying the event HTML (recurring events)
if (e.Recurrent)
{
e.Html += " (R)";
}
}