Yes, you can do that in at least two ways. You can specify an extension file where you defined your extra calendar fields. The default name of the file is CalendarExtSetVariables.qvs. (see line 115 in Qvc.qvs). You can override it if you want and use the variable Qvc.Calendar.v.ExtFields to specify a different file. The file should reside in a folder you can specify that location in the variable Qvc.Global.Extension.Directory.
For example: SET Qvc.Global.Extension.Directory = qvs_extensions;
Of course you do need to make sure that folder exists and the script file with your extra fields lives there.
The other way is to do a resident load of the calendar that the Qvc.CalendarFromField call generates, then add the extra fields to it and drop the script generated calendar table.
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