For those who are looking for a script to generate daily or weekly accounts, I created some proof-of-concept code in PHP. It generates guest accounts, with a given prefix, and an interval (default 1 week) and a configurable overlap.
The output is something that you can import then in ClearPass Guest. It may be helpful...
A live version is at: http://guest.arubalab.com/generate/generate_guest.php
The PHP source: http://guest.arubalab.com/generate/generate_guest.zip (to run it on your own web-server; I can't attach php files to the forum..)
Remember: proof-of-concept code, however easy to change to your needs.