Hey Kam 🙂
Welcome back to the Premium forums and I hope all is well. You cannot have a page with the same slug as what you have entered for your Events URL slug setting under Events > Settings. (see screenshot below)

If you want your main events page slug to be your-site.com/events and the single event page slugs to be your-site.com/event, you’ll need to mimic what I have in the screenshot above.
I hope this clears up any confusion on how the plugin slugs work and feel free to reply back with any additional questions or comments you have. Have a great Friday and thanks for choosing PRO. Cheers!