Can you input more than one event for a resource on a specific day. For example, 3 entries for same person on Jan 1, 2017??
Yes. In that case the row height will be increased automatically so that all events fit in.
You can disable event overlapping for drag and drop operations:
In order to allow entering multiple events in the same cell using BeforeEventRender you might need to increase the row margin using rowMarginBottom: