The extension eventnews expands the News extension. Events get start and end date/time, organizer, location &c. You can show them in a calendar. All this is very cool. As both Typo3 extensions vome from the same author, you should expect them to work perfectly together. For me, it was not so straightforward. Without composer, using Typo3 10 I had to add the following line to AdditionalConfiguration.php.

$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][\GeorgRinger\News\Controller\NewsController::class]= ['className' => GeorgRinger\Eventnews\Controller\NewsController::class];

The file AdditionalConfiguration.php resides inside the typo3conf folder. you may have to create it, if it does not already exist. I also had to take some action to make Month.html known to the News plugin.