Hi Mitchfrombentley,
Thank you for using the Apple Support Communities! We understand you are looking to see if you are able to delete suggestions that are appearing in Calendar, as you type the name of an event. We can help address this.
As quoted from: Add, modify, or delete events in Calendar on Mac - Apple Support, "As you type, a suggestion appears with the name and duration split into separate fields. Select the suggestion to use it, or press Esc to ignore it."
There is no information on removing these suggestions in Calendar on Mac, which would determine it is expected behavior as well. You can share feedback with Apple about this function or limitation, here: Product Feedback - Apple.
Best regards.