Currently, events and materials with broken links are hidden using a solr facet that is always applied (unless you are an admin): https://github.com/ElixirTeSS/TeSS/blob/b36c528f10cac6a0da3abf796ce5a6aae5d96d69/app/models/concerns/searchable.rb#L111 Replace this with a boolean facet in the sidebar, as we do for `include_expired` and `include_hidden`.