As openHAB 4 is now released, it would be nice if some users could test this Pull request (built binary for openHAB 4 linked there, take the version 4.1.0-SNAPSHOT).
Just make sure to uninstall a previously installed version. And please do a backup to be sure, as things will be upgraded and there is no other way back.
As things have been changed, please check out the updated readme: openhab-addons/bundles/org.openhab.binding.icalendar/README.md at 13649-extract-liveevent-tagexecutor · daMihe/openhab-addons · GitHub
Thanks to @RRoe for already doing a first test. Please report bugs or findings directly in the PR. This topic is more for discussion.