Stuck on Theme Function not getting called [SOLVED]

I have been plugging at this for a few days now. I have a page with a calendar on it. This was originally in drupal 6 and I am writing a new module for 7. All has been good except for the outputting of the form on the frontend in 7. I am sure I am missing some right in front of me. No matter how many times I pour over this code I am not able to find what I am doing wrong.

Here is my module. I have cut out the extra functions and code.

springcalendar.module

<?php

// $Id$

/**
 * Implementation of hook_menu().
 */
function springcalendar_menu() {
    $items['calendar'] = array(
        'title' => 'Calendars',
        'page callback' => 'springcalendar_page',
//        'page arguments' => array('springcalendar_page_form'),
//        'access arguments' => array('access content'),
        'access callback' => TRUE,
        'type' => MENU_CALLBACK,
    );
    return $items;
}


/**
 * Return rendered Calendar and table form
 * with 'Remind me' feature.
 * The function for calling from another custom modules.
 */
function springcalendar_page() {
    drupal_add_js(drupal_get_path('module', 'springcalendar') . '/jquery_ui_datepicker/jquery-ui-1.7.3.custom.min.js');
    drupal_add_js(drupal_get_path('module', 'springcalendar') . '/springcalendar.js');
    drupal_add_css(drupal_get_path('module', 'springcalendar') . '/jquery_ui_datepicker/jquery-ui-1.7.3.custom.css');
    drupal_add_css(drupal_get_path('module', 'springcalendar') . '/springcalendar.css');
    return theme('springcalendar_page', array('form' => drupal_get_form('springcalendar_page_form')));
}

function springcalendar_page_form($form, &$form_state) {
    $form = array();
    $future_items = array();
    $all_items = array();
    $settings = variable_get('springcalendar', array()); // get the calendar settings
    $pdf_icon = theme_image(array('path' => drupal_get_path('module', 'springcalendar') . '/images/PDFIcon.png', 'attributes' => array()));
    // Get all events
    $items = _springcalendar_get_items($settings['default_calendar']);
//     echo '<pre>item: ' . print_r($items, true) . '</pre>'; exit;
    // Sort them out for JS and future events
    foreach ($items as $item) {
//        echo '<pre>item: ' . print_r($item, true) . '</pre>';
        $nid = $item->nid;
//        echo '<pre>nid: ' . $nid . '</pre>';
        $start_date = $item->field_item_date['und'][0]['value'];
//        echo '<pre>start_date: ' . $start_date . '</pre>';
        $date = explode('/', date('d/m/y', $start_date));
//        echo '<pre>date: ' . print_r($date, true) . '</pre>';
        // Structure of array: array[year][month][day][event]
//        $all_events[$date[2]][$date[1]][$date[0]][$nid] = (array)$item;
        
        if (isset($item->field_more_information['und'][0]['value']) && ($item->field_more_information['und'][0]['value'] == 'External Link')) {
            $str_icon = l($item->field_external_link['und'][0]['title'], $item->field_external_link['und'][0]['url'], array('attributes' => array('target' => '_blank')));
            $str_link = $item->field_external_link['und'][0]['url'];
        } elseif (isset($item->field_more_information['und'][0]['value']) && ($item->field_more_information['und'][0]['value'] == 'PDF')) {
            $str_link = $item->field_pdf['und'][0]['uri'];
            $str_icon = l($pdf_icon, $item->field_pdf['und'][0]['uri'], array('html' => true, 'attributes' => array('target' => '_blank')));
        } else {
            $str_link = '';
            $str_icon = '';
        }
        
        /*
         * This is so it matches the same format as the old one
         */
        $arr_item = array(
            'date' => $item->field_item_date['und'][0]['value'],
            'link' => $str_link,
            'icon' => $str_icon,
            'nid'  => $item->nid,
            'title' => $item->title,
            'body' => $item->body['und'][0]['safe_value']
        );
        
        $all_events[$date[2]][$date[1]][$date[0]][$nid] = $arr_item;
        // Format the date value for JS
        $all_events[$date[2]][$date[1]][$date[0]][$nid]['date'] = date('d/m/Y', $start_date);
        // -1 Because today's events also should be showed
        if ($start_date > strtotime('-1 day')) {
            $future_events[$nid] = $arr_item;
        }
    }
//    echo '<pre>all_events: ' . print_r($all_events, true) . '</pre>'; 
//    echo '<pre>future events: ' . print_r($future_events, true) . '</pre>'; exit;
    drupal_add_js(array('events' => $all_events, 'raw_events' => $items, 'date' => array('year' => date('y'), 'month' => date('m'))), 'setting');
    $form['#events'] = $future_events;
    $form['events']['#tree'] = TRUE;
    foreach ($future_events as $nid => $event) {
        $form['events'][$nid] = array(
            '#tree' => TRUE,
            'on' => array(
                '#type' => 'checkbox',
                '#title' => '',
            ),
            'prior' => array(
                '#type' => 'textfield',
                '#size' => 2,
                '#title' => '',
            )
        );
    }
    $form['email'] = array(
        '#type' => 'textfield',
        '#title' => '',
    );
    $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Submit')
    );
//    $form['theme'] = 'springcalendar_page_form';
    return $form;
}


function theme_springcalendar_page_form($variables) {
    echo '<pre>$variables: ' . print_r($variables, true) . '</pre>'; exit;
    $form = $variables['form'];
//    echo '<pre>theme form: ' . print_r($form, true) . '</pre>'; exit;
//    echo '<pre>form events: ' . print_r($form['events'], true) . '</pre>'; exit;
    $rows = array();
    foreach (element_children($form['form']['events']) as $nid) {
//        echo '<pre>nid: ' . print_r($nid, true) . '</pre>'; exit;
        $event = &$form['form']['events'][$nid];
//        echo '<pre>event: ' . print_r($event, true) . '</pre>'; exit;
//        echo '<pre>event: ' . print_r($form['form']['#events'][$nid], true) . '</pre>';
        if ($form['form']['#events'][$nid]['link'] != '') {
            $str_link = l($form['form']['#events'][$nid]['title'], $form['form']['#events'][$nid]['link'], array('attributes' => array('target' => '_blank')));
        } else {
            $str_link = $form['form']['#events'][$nid]['title'];
        }
        
        $rows[] = array(
            date('d/m/y', $form['form']['#events'][$nid]['date']),
            $str_link,
            array('data' => $form['form']['#events'][$nid]['icon'], 'class' => 'info_links_cell'),
//            '<div class = "on-checkbox">' . drupal_render($event['on']) . '</div><div class = "prior-field">' . drupal_render($event['prior']) . '</div>' . t('days prior')
            '<div class = "on-checkbox">' . drupal_render($event['on']) . '</div><div class = "prior-field">' . drupal_render($event['prior']) . '</div>' . t('days prior')
        );
    }
    $rows[] = array(array('data' => '', 'class' => 'date-empty'), array('data' => '<span class = "text-block">enter your email address</span>' . drupal_render($form['email']) . drupal_render($form['submit']), 'colspan' => 2));
    $header = array(array('data' => t('Date'), 'class' => 'date'), array('data' => t('Event'), 'class' => 'event'), array('data' => t('Information'), 'class' => 'info_links'), array('data' => t('Remind me'), 'class' => 'remind-me'));
    
//    echo '<pre>rows: ' . print_r($rows, true) . '</pre>'; exit;
//    echo '<pre>rows: ' . drupal_render($form) . '</pre>'; exit;
    return theme('table', $header, $rows, array('id' => 'events-remeber', 'cellspacing' => 3)) . drupal_render($form);
}

/**
 * Implementation of hook_theme().
 */
function springcalendar_theme() {
    return array(
        'springcalendar_page' => array(
            'variables' => array('form' => NULL),
            'path' => drupal_get_path('module', 'springcalendar'),
            'template' => 'springcalendar-page',
        ),
        'springcalendar_page_form' => array(
           'variables' => array('form' => NULL),
//           'path' => drupal_get_path('module', 'springcalendar'),
//           'function' => 'theme_springcalendar_page_form',
           'render element' => 'form',
        ),
    );
}

Here is the template:
springcalendar_page.tpl.php

<?php
// $Id$
$settings = variable_get('springcalendar', array());
?>
<div id = "calendar-wrap">
  <div id="calendar-ui">
  </div>
  <div id="calendar-right-column">
    <h5>Calendar instructions</h5>
    <?php if(isset($settings['calendar_instructions'])): ?>
        <?php echo $settings['calendar_instructions']; ?>
    <?php endif; ?>
    <div id="selected-date">
      <p id = "selected-text">Selected date</p>
      <div id="selected-events"></div>
    </div>
  </div>
  <div class="clear"></div>
  <?php echo dpm($form); ?>
  <?php //print $form; ?>
  <?php // print drupal_render($form); ?>
  <?php echo '<pre>form: ' . print_r($form, true) . '</pre>';?>
  <?php // print drupal_render($form); ?>
  <?php //print render($form); ?>
</div>

No matter what I have done for the last who knows how many hours now the code is not calling the theme function theme_springcalendar_page_form()

I can get the theme to call if I use return them('springcalendar_page_form', form); at the end of function springcalendar_page_form()

however this does not appear to generate the form correctly and is because I think its not being processed correctly. This point the code is not calling the theme_ function.

Output of the form should look like the one featured here http://aquariusplatinum.com/investor_calendar

Any help with where I am going wrong would be appreciated.

{UPDATE}

This is now solved. A colleague helped me solve this. I was not far off. The cause of my problem was that I was mixing the names of some of the default drupal naming conventions and I was using them rather than over riding them. The solution was in summary.

change

function springcalendar_page() {
    drupal_add_js(drupal_get_path('module', 'springcalendar') . '/jquery_ui_datepicker/jquery-ui-1.7.3.custom.min.js');
    drupal_add_js(drupal_get_path('module', 'springcalendar') . '/springcalendar.js');
    drupal_add_css(drupal_get_path('module', 'springcalendar') . '/jquery_ui_datepicker/jquery-ui-1.7.3.custom.css');
    drupal_add_css(drupal_get_path('module', 'springcalendar') . '/springcalendar.css');
    return theme('springcalendar_page', array('form' => drupal_render(drupal_get_form('springcalendar_page_form'))));
}

to

function springcalendar_page() {
  drupal_add_js(drupal_get_path('module', 'springcalendar') . '/jquery_ui_datepicker/jquery-ui-1.7.3.custom.min.js');
  drupal_add_js(drupal_get_path('module', 'springcalendar') . '/springcalendar.js');
  drupal_add_css(drupal_get_path('module', 'springcalendar') . '/jquery_ui_datepicker/jquery-ui-1.7.3.custom.css');
  drupal_add_css(drupal_get_path('module', 'springcalendar') . '/springcalendar.css');
  $form = drupal_get_form('springcalendar_page_calander_form');
  return theme('springcalendar_page', array('form' => $form));
}

and

function springcalendar_page_form($form, &$form_state) {
to

function springcalendar_page_calander_form($form, &$form_state) {

Then on my theme function

function springcalendar_theme() {
    return array(
        'springcalendar_page' => array(
            'variables' => array('form' => NULL),
            'path' => drupal_get_path('module', 'springcalendar'),
            'template' => 'springcalendar-page',
        ),
        'springcalendar_page_form' => array(
           'variables' => array('form' => NULL),
           'render element' => 'form',
        ),
    );

changed too

function springcalendar_theme() {
  return array(
      'springcalendar_page' => array(
          'variables' => array('form' => NULL),
          'path' => drupal_get_path('module', 'springcalendar'),
          'template' => 'springcalendar-page',
      ),
      'springcalendar_page_form' => array(
          'variables' => array('form' => array()),
          'function' => 'springcalendar_form_theme',
      ),
  );
}

Then on the template page

  <?php echo dpm($form); ?>

changed to
<?php echo theme('springcalendar_page_form', array('form' => $form)); ?>

I hope this helps others in the future.