events with an expiration date

have a look at this small plugin: https://gitlab.rrze.fau.de/rrze-webteam/rrze-post-expiration
(GNU General Public License v2.0 or later – so you can use it)

you will have then on all posts under publishing the post :

after expiration those post/pages goes to an extra “Expired” State.
PS – there is only the setting for post/pages not for portfolio. BUT only two places in sourcecode can change that to have it for portfolio too.
/includes/main.php (line 86 – add to the array ‘portfolio’ )
and
/includes/settings.php (line40 – add a new line with portfolio)

just a question – you are talking about events; you got an events plugin that does not have expiration dates?

Sorry i only read your topic – not the post
there are lot of plugins that can be asumed under events f.e.: https://wp-events-plugin.com/ The Free Plan is good enough for the most possibilities.