I guess the problem is that the DataResourceField value doesn't match the Resource.Value. It must match exactly, i.e. the same case, no extra spaces, etc.
See a general explanation for the Pro edition:
http://kb.daypilot.org/101644/events-not-showing-up-in-the-scheduler/
The debugging instructions won't work with the Lite edition but the matching logic is the same.
You can also check the source code of the example:
http://www.daypilot.org/demo/Lite/SchedulerMonth.aspx
It's included in the Lite package at Demo/SchedulerMonth.aspx.