We have introduced thread prefixes to improve the display of the events list.

Now when you add a thread to post an event to the forum, you will get a dropdown box above the title of the thread to select a prefix. Please choose the most suitable for your event.

The prefix will appear at the beginning of the thread title on the forum listing.
We've updated some events already to include them. You can see some already with prefixes like
Theatre:
Food & Wine Festival: