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This action runs before all fields in a field group is displayed. It's usually used for outputting custom HTML.

do_action( 'rwmb_before', $meta_box );

It takes 1 parameter: the instance of RW_Meta_Box class for the current field group.

To run this action for a specific field group, use a variation of this action:

do_action( "rwmb_before_{$field_group_id}", $meta_box );


This code wraps a field group with ID event-details into a custom div:

add_action( 'rwmb_before_event-details', function( $meta_box ) {
echo '<div class="my-div">';
} );

add_action( 'rwmb_after_event-details', function( $meta_box ) {
echo '</div>';
} );