To make an event display first in the event feed you can pin the event :
Click the three dots on the event on the event feed or event management page.
Select Pin – the event will now display first in the feed.
Up to three events can be pinned at any one time.
If you have three pinned events and you wish to pin another you must unpin one first:
Click the three dots on the event on the event feed or event management page.
Select Unpin – the event will now display in order of when it was published.