ondataselected="#{rich:component('calendarStartDate')}.setValue('#{eventPlanner.startDate}')"

 ondateselected="Richfaces.getComponent('calendar',this).close(true); return true"

<rich:calendar
    id="calendarStartDate"
    value="#{eventPlanner.startDate}"
    datePattern="#{utilsBean.dateFormatForEvents}"
    enableManualInput="false"
    todayControlMode="hidden"
ondateselected="Richfaces.getComponent('calendar',this).close(true); return true"
     showApplyButton="true">
</rich:calendar>