In some cases, especially when grouping is involved, the day/week/workWeek views may end up with too many events in a single slot. If the total width of those events could not fit within the slot size, those events will overflow and cover some of their sibling events. To avoid such a result, events rendering in a scrollable container should be considered. This way each event will have a minimum width even if it has too many siblings in the same slot.

Here is a Dojo sample demonstrating the case: https://dojo.telerik.com/UnUnUTAW/6