When trying to set up an event invitation, announcement or reminder, there are some users not listed in the recipients list.
|* By default subscribers may receive event emails for public events only. Administrators can override this with a global setting via: Admin Menu > options > advanced tab > check "Allow private event emails to any user or subscriber" > SAVE|
To have a user to show in the reminders selection list, go to Admin Menu, then Categories, then edit the category and click on the user to highlight and give them permission, then save the edited category. Return to edit the event, the user should then be listed in the reminders selection list.