Therefore you don’t should make changes to the HTML’s structure when updating your schema markup. The function has been rescheduled to some later date. Update the startDate and endDate with the pertinent new dates. Optionally, You may as well mark the eventStatus subject as rescheduled and include the previousStartDate. - https://bookmarkindexing.com/story18537409/what-does-json-schema-not-required-fields-mean