Step 1:
Navigate to the event that you would like to update
Step 2:
Select Edit on the Product Details of that Event
Step 3:
Scroll down to the Permalink, Redirect & SEO Settings section and expand by clicking the down arrow
Step 4:
Under Redirect select URL and enter a new url. Note that the new url will need to be the entire url including https://
Then Save the changes
Step 4:
Select View on Frontend to confirm that the event takes you to the new URL