Show Group Header without details

Hello,
I have a report that's grouped by Client Name and in the details section I have appointment date, practitioner, appt time, and the service. I have a parameter to select a date range but if a client doesn't have an appointment in that range then it's not showing.
I'd like to still show that Client Name even though they don't have an appt.
Any suggestions?

I forgot to mention that I have three fields:
appt_data, clinician, and patient
I've included how I've linked them with left outer joins


Edited by Andrewarbogast - 04 Oct 2017 at 9:48am