Here are two items of mention
- In a GitHub search this turned up
Notice layouts-event-list-widget As I have no experience with that can not say more.
- If you have ever used the Developer Tools as part of a browser by pressing F12 you might be able to isolate the HTML for the banner and maybe that will include the name of something recognizable in an HTML tag.
If the site is public and requires no login and you can post the URL here, then some of us can take a look at the page using F12 and maybe learn something helpful from the HTML.