BCC event organizers for the RSVP email.

tec-tickets-email-rsvp-organizers-bcc.php

<?php
//* Do NOT include the opening php tag

add_filter( 'tec_tickets_emails_dispatcher_rsvp_headers', 'my_add_bcc_email_organizers_headers', 10, 2 );

function my_add_bcc_email_organizers_headers( $headers, $dispatcher ) {
	$email   = $dispatcher->get_email();
	$post_id = $email->get( 'post_id' );

	if ( ! $post_id || ! function_exists( 'tribe_get_event' ) )  {
		return $headers;
	}

	$event = tribe_get_event( $post_id );

	if ( empty( $event ) ) {
		return $headers;
	}

	// If the event has organizers set
	if ( ! tribe_has_organizer( $post_id ) ) {
		return $headers;
	}

	// Get the organizers
	$organizers = tribe_get_organizer_ids( $post_id );

	// Loop through the organizers
	foreach ( $organizers as $organizer_id ) {
		// Get the organizer email address
		$organizer_email = stripslashes_deep( html_entity_decode( tribe_get_organizer_email( $organizer_id ), ENT_COMPAT, 'UTF-8' ) );

		// Add the organizer email info to our emails array
		$emails[] = $organizer_email;
	}

	if ( empty( $emails ) ) {
		return $headers;
	}

	$headers['Bcc'] = implode( ",", $emails );

	return $headers;
}