ex i want a cell like it :
Event Text under event
You can write to cells using onBeforeCellRender event handler:
https://api.daypilot.org/daypilot-scheduler-onbeforecellrender/
In order to make the text accessible even if there is an event scheduled for that slot you'll need to increase the row margin:
https://api.daypilot.org/daypilot-scheduler-rowmarginbottom/