Remove custom post type generated by a plugin (The Events Calendar) [closed]

Custom Post Type registrations in WordPress are not persistent. CPT only exists as long as registration code had been executed in a current page load. If the registration is disabled the data will be in database, but pretty much ignored and invisible to WP core.

It is hard to guess what happened in your specific case. Most likely plugin had introduced persistent changes to the system, such as installing code files outside its directory or creating native WP entries (like a normal page).