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ACF Documentation/ Query posts by custom fields https://www.advancedcustomfields.com/resources/query-posts-custom-fields/

ACF support/ How to Query Posts using Flexible Content? https://support.advancedcustomfields.com/forums/topic/how-to-query-posts-using-flexible-content/

ACF support/ Query between dates using Date Picker fields https://support.advancedcustomfields.com/forums/topic/query-between-dates-using-date-picker-fields/

ACF support/ WP_Query based on a relationship field in a Flexible Content field. https://support.advancedcustomfields.com/forums/topic/wp_query-based-on-a-relationship-field-in-a-flexible-content-field/