Hi Marcus,
Thanks for reaching out!
Currently, you could use categories to mark events as new, or also set events as “featured”, but you would then need to go in manually and remove those markers. To automatically remove them after a certain amount of time, you would need to do a customization. Our themer’s guide is the place to start if you’d like to give it a shot!
I’d recommend posting this idea in our Feature Ideas Forum, which is what we use to gauge user interest in new features and help guide future development efforts.
I’m sorry I don’t have a more straightforward solution for you, but I hope this helps! Please let me know if you have any other questions.
Thanks,
Jennifer