Configuration/settings/readonly webdav collections
$c->readonly_webdav_collections = false;
If true, then calendars accessed via WebDAV will only be readonly. Any changes to them must be applied via CalDAV.
You may want to set this to false during your initial setup to make it easier for people to PUT whole calendars as part of the conversion of their data. After this it is recommended to set it to true again, so that clients which have been misconfigured are readily identifiable.
Available from DAViCal version: 0.9.2 and later