What did I do wrong? Second variable is not saving or displaying

I am attempting my first custom plugin for a project and it seems to be about 90% working (somehow). I am able to save the title but not the URL for the second variable (event url) to save or work. I used a sample plugin for a template but all the examples I am seeing only have 1 variable to save. Can someone look at my code and tell me why the event_url doesnt work.

<?php

/*
	Plugin Name: College of Engineering Events Widget
	Plugin URI: http://creative.umich.edu
	Description: Plugin created to display the events from the college of engineering sites
	Version: 1.0
	Author: Michigan Creative, Wally Kolcz
	Author URI: http://creative.umich.edu
	License: GPL2
*/

class CoE_Events extends WP_Widget {

	function CoE_Events(){
		$widget_ops = array('classname' => 'CoE_Events', 'description' => 'Plugin created to display the events from the college of engineering sites' );
		$this->WP_Widget('CoE_Events', 'CoE Events', $widget_ops);
	}

	function form($instance){
		$instance = wp_parse_args( (array) $instance, array( 'title' => '', 'event_url'=>'' ) );
		$title = $instance['title'];
		$url = $instance['event_url'];
		?>
	  	<p><label for="<?php echo $this->get_field_id('title'); ?>">Title: <input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo attribute_escape($title); ?>" /></label></p>

		<p><label for="<?php echo $this->get_field_id('event_url'); ?>">Events Feed URL: <input class="widefat" id="<?php echo $this->get_field_id('event_url'); ?>" name="<?php echo $this->get_field_name('event_url'); ?>" type="text" value="<?php echo attribute_escape($event_url); ?>" /></label></p>

	<?php
	  }

	  function update($new_instance, $old_instance){
	    $instance = $old_instance;
	    $instance['title'] = $new_instance['title'];
	    $instance['event_url'] = $new_instance['event_url'];
	    return $instance;
	  }

	  function widget($args, $instance){
	  	extract($args, EXTR_SKIP);

	  	echo $before_widget;
	  	$title = empty($instance['title']) ? ' ' : apply_filters('widget_title', $instance['title']);
	  	$event_url = empty($instance['event_url']) ? ' ' : apply_filters('widget_event_url', $instance['event_url']);

	  	if (empty($title)){
			$title = 'Events';
		}

		if (empty($event_url)){
			$event_url = 'http://www.engin.umich.edu/college/about/cal/event-calendar';
		}

		$json = event_url.'/futurejson';

	  	//Get the feed from the url the user provided
	 $ch = curl_init();
	 curl_setopt($ch, CURLOPT_URL, $json);
	 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	 curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
	 $feeds = curl_exec($ch);
	 curl_close($ch);

	//decode the data for php
	$data = json_decode($feeds,true);

	//var_dump($data);

	//Check to see if there are any errors in the feed. If yes, output error as result, if not, then start the process of creating block
	if (json_last_error() === JSON_ERROR_NONE) {
    	//Is the json an array?
		if (is_array($data)) {
			//Start the CSS wrapper
			$events = '<div class="promo promoHolderEvents"><a class="promoEvents" href="'.$event_url.'"><h3>'.$title.'</h3><h4>'.getDatesHeaders($data['events'][0]['month'], $data['events'][1]['month']).'</h4>';
			//Loop over results to get the information and create the posts
			for ($i = 0; $i < 2; $i++) {
				$events.='<div class="pDateItem"><p class="pDate">'.addOrdinalNumberSuffix($data['events'][$i]['day']).'</p><p class="pDate_Info">'.$data['events'][$i]['title'].'</p></div>';
			}

			//End the wrapper'.$url.'
			$events.='<span class="linkCtA">see all</span></a></div>';
		}
	} else {
		 switch (json_last_error()) {
			case JSON_ERROR_DEPTH:
				echo ' - Maximum stack depth exceeded';
			break;
			case JSON_ERROR_STATE_MISMATCH:
				echo ' - Underflow or the modes mismatch';
			break;
			case JSON_ERROR_CTRL_CHAR:
				echo ' - Unexpected control character found';
			break;
			case JSON_ERROR_SYNTAX:
				echo ' - Syntax error, malformed JSON';
			break;
			case JSON_ERROR_UTF8:
				echo ' - Malformed UTF-8 characters, possibly incorrectly encoded';
			break;
			default:
				echo ' - Unknown error';
			break;
		};
	} 

	echo $events;

	echo $after_widget;

	}

	function getDatesHeaders($m1, $m2){
		if($m1 != $m2){
			$months = date('M', strtotime('2013-'.$m1.'-01')).'/'.date('M', strtotime($m2.'-01-2013'));
		}else{
			$months = date('M', strtotime('2013-'.$m1.'-01'));
		}

		return $months;
	}

	function addOrdinalNumberSuffix($num) {
		if (!in_array(($num % 100),array(11,12,13))){
			switch ($num % 10) {
				// Handle 1st, 2nd, 3rd
				case 1:  return $num.'st';
				case 2:  return $num.'nd';
				case 3:  return $num.'rd';
			}
		}
		return $num.'th';
	}
}
add_action( 'widgets_init', create_function('', 'return register_widget("CoE_Events");') );
?>