Hi Grant,

I have tested the described scenario and I reproduced the issue on my side. 

I have converted this support ticket into a public feedback item. Please follow it in order to receive an email notifications when its status changes. I have also updated your Telerik points as a small sign of gratitude for your involvement. 

Workaround:

To find when the calendar changes its view and mode states you have to subscribe to its PropertyChanged event and look for the ViewMode property in the event handler, here is a quick example:

private void calendar_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
    if (e.PropertyName == nameof(RadCalendar.ViewMode))
    {
        // Mode and view are changed
    }
}

I hope the provided information was helpful. 

Regards,
Didi
Progress Telerik