The Formerly scheduled start out date with the occasion if an celebration is rescheduled. Should you insert previousStartDate, you have to also increase the eventStatus house and set the eventStatus to EventRescheduled. Will not use other celebration statuses. The situation may be due to either spammy material or spammy markup https://addons.prestashop.com/nl/seo-zoekmachineoptimalisatie-vermelding/31857-automatische-google-rich-snippets-json-ld-opengraph-seo.html