Set up DAViCal to separate from Google Contacts
https://wiki.archlinux.org/index.php/DAViCal and https://wiki.davical.org/index.php/DAViCal_Web_Client would be added to the webserver under a new name (Anansi for web-of-trust?).
Would then need a Cal Sync client on Android to enable access. https://wiki.davical.org/index.php/CalDAV_Clients/Android
Deleting a branch is permanent. It CANNOT be undone. Continue?