Thanks for the good feedback.
Post edit restrictions by categories was added to the development version 4.19.b. It is available at download page.
Post view restrictions by categories is under development currently.
If WECRB plugin realized events as the custom post type veiw/edit restrictions by categories should work for events then.
It will be useful to get mentioned WECRB plugin for testing. If it’s applicable, send the installation package to support [at-sign] role-editor.com. It will be used for the testing purpose only at my local development environment.