Select Author from Screen Options tab

The ‘post author’ is the ‘Event Organiser’ – that should be present, at least in the screen options.

Mmm… odd… this works on one test install, but not another.

Work-around is simple, change this line: https://github.com/stephenharris/Event-Organiser/blob/1.7.3/event-organiser-edit.php#L28 so that ‘core’ becomes ‘normal’.

That should fix it. I’ll include it in the next release.