“Event” schema with dynamic dates

Hello,

Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.

Are these custom fields came from your theme or from another plugin besides ACF? If so, you can make use of this filter to create a custom variable and assign the custom field here:

/**
* Action: 'rank_math/vars/register_extra_replacements' - Allows adding extra variables.
* Snippet to register variable that will return all terms in custom taxonomy
*/
add_action( 'rank_math/vars/register_extra_replacements', function(){
	rank_math_register_var_replacement(
	   'shortcode_var_name', [
	   'name'        => esc_html__( 'Author name', 'rank-math' ),
	   'description' => esc_html__( 'Author description', 'rank-math' ),
	   'variable'    => 'shortcode_var_name', /* the actual variable: %shortcode_var_name% */
	   'example'     => shortcode_var_name_call_back(),
	   ],
	   'shortcode_var_name_call_back'
   );
});
function shortcode_var_name_call_back(){
	return "EXAMPLE VALUE";
}

After that, you can then now use this custom variable name to your schema field: %shortcode_var_name%.

Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.