Authenticated Users allowed by system role to manage own calendar entries (moodle/calendar:manageownentries)
Cannot do so.
Undefined property: stdClass::$eventtype in /web/head/calendar/lib.php on line 1721
(Possibly) related example:
A teacher can enter New Event in a course (s)he teaches but not in Calendar on My Home page, student cannot enter any events either in the course or on My Home.