To transfer the calendar to a flash drive, the Export option needs to be used, but that involves HP Photo Creation to support this feature through Export. Start the software and load your calendar section then use the main menu of the application and go to File > Export or File > Save As.
Sometimes the Save as and Export functions offer the possibility to save/export to various file formats. "Save as" is used for when you want to migrate the content while having 100 % compatibility.