/**
     * Return events from all businesses owned by a user.
     * Note: Returns generic objects like fetch_orig().
     */
    public function events () {
        $businesses = self::query ()->where ('owner', $this->id)->fetch_field ('id');

        $qmarks = array_fill (0, count ($businesses), '?');

        return DB::fetch (
            'select * from #prefix#myapp_event where id in(' . join(',', $qmarks) . ')',
            $businesses
        )
    }