This event is being posted by a ‘Contributor’. In this case username – zoqba.
To allow access to this, a user needs to be registered by admin (me) and then given the url for the specific events input page of WP admin dashboard. https://imsida.org/wp-admin/post.php?post=677&action=edit
Once posted by subscriber, the event would need to be reviewed by an admin (Alan) before publishing…
If it is going to be just one person who will enter event details, I recommend setting them up as ‘editor’ user not subscriber