You need to update the Base Calendar for many roles and there is no calendar.xml available in the xog files
Release : All Supported Releases
Component :PPMXOG
If you read (xog out) resource data from Clarity using rsm_resources_read.xml you will see a line for calendar that looks like
<Calendar baseCalendar="Standard" resetCalendar="true">
You can use xog in a process to update baseCalendar