function tribe_events_event_classes( $event = 0, $echo = true ) {
		global $post, $wp_query;

		// May be called when the global $post object does not exist - ie during ajax loads of various views
		// ... creating a dummy object allows the method to proceed semi-gracefully (interim measure only)

		//If $post object doesn't exist and an $event_id wasn't specified, then use a dummy object
		if ( $event instanceof WP_Post ) {
			$event_id = $event->ID;
		} elseif ( $event !== 0 ) {
			$event_id = $event;
		} else {
			$event_id = $post->ID;
		}

		if ( ! $event_id ) {
			return '';
		}

		$classes         = array( 'type-tribe_events', 'post-' . $event_id, 'tribe-clearfix' );
		$tribe_cat_slugs = tribe_get_event_cat_slugs( $event_id );

		foreach ( $tribe_cat_slugs as $tribe_cat_slug ) {
			if ( ! empty( $tribe_cat_slug ) ) {
				$classes[] = 'tribe-events-category-' . $tribe_cat_slug;
			}
		}
		if ( $venue_id = tribe_get_venue_id( $event_id ) ) {
			$classes[] = 'tribe-events-venue-' . $venue_id;
		}
		foreach ( tribe_get_organizer_ids( $event_id ) as $organizer_id ) {
			$classes[] = 'tribe-events-organizer-' . $organizer_id;
		}
		// added first class for css
		if ( ( $wp_query->current_post == 0 ) && ! tribe_is_day() ) {
			$classes[] = 'tribe-events-first';
		}
		// added last class for css
		if ( $wp_query->current_post == $wp_query->post_count - 1 ) {
			$classes[] = 'tribe-events-last';
		}

		// Mark 'featured' events
		if ( tribe( 'tec.featured_events' )->is_featured( $event_id ) ) {
			$classes[] = 'tribe-event-featured';
		}

		/**
		 * Filters the event wrapper classes before they are returned
		 *
		 * @since 4.6.20 added the $event_id parameter
		 *
		 * @param array $classes  The classes that will be returned
		 * @param int   $event_id Current event ID
		 */
		$classes = apply_filters( 'tribe_events_event_classes', $classes, $event_id );

		if ( $echo ) {
			echo implode( ' ', $classes );
		} else {
			return implode( ' ', $classes );
		}
	}