Hi Connie!
Thanks for getting in touch with us!
Have you checked what the Community rewrite slug looks like? You can see that by going to Events –> Settings –> Community. There is good article on Linking to Community Events Pages that might be useful to set up the front end form.
If you still can’t solve this, could you please share your system information with us by following this guide
Let me know about this so I can further assist you.
Thanks!
Victor