Hi Joe,
Thanks for using our plugins. I can help out here.
The Login Form for Community Events uses the Standard WordPress form: wp_login_form
https://codex.wordpress.org/Function_Reference/wp_login_form
It does not have a template as a function checks if it should show or not and then calls wp_login_form if it should show.
If you want a custom login form the best thing to do is add a check at the top of the community template. Then you could add the form the way you would like and only let people pass to our coding once logged in and this would bypass our form.
Let me know if you have any follow up questions.
Thanks