derekantrican/GAS-ICS-Sync: A Google Apps Script for syncing ICS/ICAL files (github.com)

If anyone knows of a tool that can sync both ways between Google Calendar and a CalDAV server, I'd love to know about it.

That's cool to see. I have taken a liking to pal, so I've been wondering if some kind of tool along these lines might help me use both pal and Google calendar together to eliminate a little bit of redundancy.