Hi Aeky,
Thanks for reaching out!
Unfortunately, the only way to edit an organizer or a venue that has already been created is through that post edit screen on the backend. You can however remove the option.
You can hide it easily with CSS by adding the following to your Additional CSS area under Appearance > Customize (if you have one) or the style.css file of your child theme.
#edit-tribe-venue .edit-linked-post-link {
display: none;
}
I’m sorry I don’t have a better answer for you, but please let me know how that works for you!
Thanks,
Jennifer