How to store multiple values in 1 meta_key with radio input?

How do I store multiple values in one meta_key through a radio input and then display the two values on the page? One value would be a text string and the other would be a link that would go with that text. These values would not change and would be populated by the data in the radio box.

Here is the code for my meta boxes. I want the radio box event_venue to have an additional value that would be the link to the venue page. That way I would just have to click the radio button for the venue and the name and link to the page would automatically show up.

 $meta_box['event'] = array(
    'id' => 'event-meta-details',
    'title' => 'Event Information',
    'context' => 'normal',
    'priority' => 'high',
    'fields' => array(
        array(
            'name' => 'Start Date',
            'desc' => '(Enter yyyy/mm/dd)',
            'id' => 'start_date',
            'type' => 'text',
            'default' => ''
        ),
        array(
            'name' => 'End Date',
            'desc' => '(Enter yyyy/mm/dd)',
            'id' => 'end_date',
            'type' => 'text',
            'default' => ''
        ),
        array(
            'name' => 'Opening',
            'desc' => 'YYYY-MM-DD 00:00 24 hour clock',
            'id' => 'opening_time',
            'type' => 'text',
            'default' => ''
        ),
           array(
            'name' => 'Closing',
            'desc' => 'YYYY-MM-DD 00:00 24 hour clock',
            'id' => 'closing_time',
            'type' => 'text',
            'default' => ''
        ),
        array(
            'name' => 'Artist Talk - Lecture',
            'desc' => 'YYYY-MM-DD 00:00 24 hour clock',
            'id' => 'artist_talk_time',
            'type' => 'text',
            'default' => ''
        ),
        array(
        'name' => 'Venue',
        'desc' => 'Venue of Event',
        'id' => $prefix . 'event_venue',
        'type' => 'radio',
        'options' => array(
            array('name' => 'William Busta Gallery', 'value' => 'William Busta Gallery'),
            array('name' => 'Spaces', 'value' => 'Spaces'),
            array('name' => 'Enter Text Below', 'value' => 'other')
        )
    ),
        array(
            'name' => 'Custom Venue',
            'desc' => 'Enter Venue Name if Enter Text Below is Checked',
            'id' => 'custom_event_venue',
            'type' => 'text',
            'default' => ''
        ),
        array(
                'name' => 'Featured / Reccomended',
            'desc' => 'Recommended Event',
            'id' => 'featured_event',
            'type' => 'checkbox',
            'default' => ''
          )

    )
);

Right now I display the venue value like this.

if (get_post_meta(get_the_ID(),'event_venue', true) != 'other') { 
    echo get_post_meta(get_the_ID(),'event_venue', true);
    }
if (get_post_meta(get_the_ID(),'event_venue', true) == 'other') {
    echo get_post_meta(get_the_ID(),'custom_event_venue', true);
    }

This is the code that saves the data.

// Save data from meta box
function plib_save_data($post_id) {
    global $meta_box,  $post;

    //Verify nonce
    if (!wp_verify_nonce($_POST['plib_meta_box_nonce'], basename(__FILE__))) {
        return $post_id;
    }

    //Check autosave
    if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
        return $post_id;
    }

    //Check permissions
    if ('page' == $_POST['post_type']) {
        if (!current_user_can('edit_page', $post_id)) {
            return $post_id;
        }
    } elseif (!current_user_can('edit_post', $post_id)) {
        return $post_id;
    }

    foreach ($meta_box[$post->post_type]['fields'] as $field) {
        $old = get_post_meta($post_id, $field['id'], true);
        $new = $_POST[$field['id']];

        if ($new && $new != $old) {
            update_post_meta($post_id, $field['id'], $new);
        } elseif ('' == $new && $old) {
            delete_post_meta($post_id, $field['id'], $old);
        }
    }
}

add_action('save_post', 'plib_save_data');

Thank you in advance for any advice. I am very confused.