How to change the background color for weekend in Gantt
In Gantt, it is possible to customize the weekend highlight color by using weekendBackground property, please refer the following code example for this.
$(function () {
$("#GanttContainer").ejGantt({
dataSource: defaultGanttData,
taskIdMapping: "TaskID",
weekendBackground:"#00FFFF",
//..
});
});
Screen shot:

A simple sample to change the background color for the weekend in Gantt is available here.