This command is an update command, that is, it only changes the values of the parameters you specify. It is not necessary to supply all parameters in the command, only the ones you want to change. Calendar properties are special states of a calendar, which includes the calendar's name, read and write permission values (acl parameter), the list of owners, and the list of categories.
Use set_calprops to do the following:
Change the name of the calendar.
Change owner of calendar.
Change category of calendar.
Change read permission of calendar’s event.
Change write permission of calendar’s event.
Change description of calendar.
Change character set of calendar.
Change language of calendar.
Change email contact of this calendar.
Change the time zone-identifier of the calendar.
Allow or disallow double booking for this calendar.