The optimal Image Size for the Slider and Featured Images is
510 pixels wide x 285 pixels in height (510 x 285)
However, any size image can be used as it will be scaled down by the calendar.
WordPress Plugin (v.2.6.8 and older + old platform)
The optimal Image Size for the Slider and Featured Images is
510 pixels wide x 285 pixels in height (510 x 285)
However, any size image can be used as it will be scaled down by the calendar.