Given a site and a block on that site, create a folder under json_file_base_folder where the events.json file and related image files will be stored. If the base folder doesn't exist, the function will throw an error.
Given a site and a block on that site, create a folder under json_file_base_folder where the events.json file and related image files will be stored. If the base folder doesn't exist, the function will throw an error.