Hi Jeanine!
Thanks for reaching out! Let me help you with that.
Yes, you can edit the URL for the event, just as you would with any regular post for your site. The only thing you should be aware of, is that if you shared that link before in another site (for example in Facebook) then if the people try to go to that url after you changed it, they will get a 404 page not found error.
To avoid that, you should try to edit the URL for your event before you publish it.
I hope that helps! Let me know if you have any follow up questions.
Best,
Victor