displaying multiple entries with a common date in one display row

I am creating a sign-up list form from people to volunteer for particular jobs on a particular date.  the form accepts three inputs

1). date – a dropdown list of dates preloaded with dates I care about

2). name-a single line text field

3). job-a drop down selector that allows the person to select one of three jobs

In general one person will volunteer for 1 job on a particular date.  the display I want to create is a matrix of

date —job_1—-Job_2—job_3

jun-6–Smiths–Jones—Doe Family

my current custom display http://carbondalecoc.com/youth-activities-via-custom-display/

lists the date three times by using [if] codes in the custom display…but I’m not seeing how to collapse these three rows into one row.