Yes, either you or a designated Day-of-Contact needs to be present for both the pickup and delivery of the items.
If you have already scheduled your appointment and wish to designate a Day-of-Contact in your place, you can update this in your online Clutter Account Portal! Click the Appointments tab and the View/Edit Details button. From there, scroll to the section labeled Day-of-Contact to add the new name and phone number to save to the order. This Day-of-Contact will now receive appointment related communication!