Creating A 2nd Schedule Table?

I have a table right now, that gives when an event was done in a date time (eg. Event done Jan 1, 2014, event 2 done Jan 2, 2014).

What is a feasible way to make a second table to join on this date time which provides the type of worker (eg. part time, full time, volumteer, etc) without making a table with every day, hour and minute as a separate row?

For example, a test was done on Jan 1, 2014 at 1pm, in table A. I was thinking my second table would list every date and time and fill in what type of worker was on at that minute/time. Then I would left outer join with my first table, so the end result would be Event A was done Jan 1, 1pm, therefore it was a: Volunteer worker. Event B was done Jan 1, 2pm, therefore it was a : Full time worker.

But I realize that it is not feasible to write a table with every date/time available to accommodate all the different types of shifts.