• Custom post types in WordPress
• Including Page Templates from a WordPress Plugin
• WordPress Custom Post Type Code Generator

To display the widget I extend the widget function.

  function widget($args, $instance){
	extract( $args );
    	$title = apply_filters( 'widget_title', $instance['title'] );	
    	$nextSunday = strtotime("next sunday");
	$wn = ceil( date( 'j', $nextSunday) / 7 );
	$ldom = mktime(0, 0, 0, (date('m') + 1), 0, date('Y'));
		
	$diff = round(abs($nextSunday-$ldom)/86400);
	$text = "";
				
	switch ($wn) {
    	  case 1:
            $text= $instance['Sunday1'];
            break;
    	  case 2:
            $text= $instance['Sunday2'];
            break;
    	  case 3:
             $text= $instance['Sunday3'];
             break;
          case 4:
             if (diff>=7){
        	$text= $instance['Sunday4'];
             }else {
        	$text= $instance['Sunday5'];
             }
           break;
           case 5:
        	$text= $instance['Sunday5'];
        	break;
	}?>
		
		<?php echo $before_widget; ?>
		
		<div class="clsPageContent">
		
		
		<?php if ($title) { echo $before_title 
                                           . "<h3>" 
                                           . $title 
                                           . "" 
                                           . $after_title; } ?>
		
		<ul>
			<li>Sunday:</li>
			<li>< ?php echo $text ?> </li>
			<li> </li>
			<li>< ?php echo  $instance['MidWeekName'] ?> :</li>
			<li>< ?php echo  $instance['MidWeekTime'] ?> </li>
		</ul><ul>
		
		<p>
			< ?php echo  $instance['ExtraMessage'] ?>
		</p>
		</ul></div>
		
		< ?php echo $after_widget; ?>
		
    	< ?php
	
	}

Of course you need to have enter the information.

function form($instance){
      $defaults = array( 'title' => 'Example', 
                         'name' => 'John Doe', 
			'Sunday1' => '10 AM and 5 PM',
			'Sunday2' => '2 PM and No Evening Service',
			'Sunday3' => '10 AM and 5 PM',
			'Sunday4' => '10 AM and 5 PM',
			'Sunday5' => '10 AM and No Evening Service',
			'MidWeekName' => 'Monday',
			'MidWeekTime' => '7 PM',
			'ExtraMessage' => ''
			);
								
       $instance = wp_parse_args( (array) $instance, $defaults ); ?>
			
	<label for="<?php echo $this->get_field_id( 'title' ); ?>"> Title:</label>
	<input id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" value="<?php echo $instance['title']; ?>" style="width:100%;" />
		<br/>
		<br/>
					
	<label for="<?php echo $this->get_field_id( 'Sunday1' ); ?>"> First Sunday:</label>
	<input id="<?php echo $this->get_field_id( 'Sunday1' ); ?>" name="<?php echo $this->get_field_name( 'Sunday1' ); ?>" value="<?php echo $instance['Sunday1']; ?>" style="width:100%;" />
		<br/>
					
					<label for="<?php echo $this->get_field_id( 'Sunday2' ); ?>"> Second Sunday:</label>
					<input id="<?php echo $this->get_field_id( 'Sunday2' ); ?>" name="<?php echo $this->get_field_name( 'Sunday2' ); ?>" value="<?php echo $instance['Sunday2']; ?>" style="width:100%;" />
					<br/>
					
					<label for="<?php echo $this->get_field_id( 'Sunday3' ); ?>"> Third Sunday:</label>
					<input id="<?php echo $this->get_field_id( 'Sunday3' ); ?>" name="<?php echo $this->get_field_name( 'Sunday3' ); ?>" value="<?php echo $instance['Sunday3']; ?>" style="width:100%;" />
					<br/>
					
					<label for="<?php echo $this->get_field_id( 'Sunday4' ); ?>"> Fourth Sunday:</label>
					<input id="<?php echo $this->get_field_id( 'Sunday4' ); ?>" name="<?php echo $this->get_field_name( 'Sunday4' ); ?>" value="<?php echo $instance['Sunday4']; ?>" style="width:100%;" />
					<br/>
					
					<label for="<?php echo $this->get_field_id( 'Sunday5' ); ?>"> Fifth Sunday:</label>
					<input id="<?php echo $this->get_field_id( 'Sunday5' ); ?>" name="<?php echo $this->get_field_name( 'Sunday5' ); ?>" value="<?php echo $instance['Sunday5']; ?>" style="width:100%;" />
					<br/>
					<br/>
					
					<label for="<?php echo $this->get_field_id( 'MidWeekName' ); ?>"> Mid Week Service:</label>
					<input id="<?php echo $this->get_field_id( 'MidWeekName' ); ?>" name="<?php echo $this->get_field_name( 'MidWeekName' ); ?>" value="<?php echo $instance['MidWeekName']; ?>" style="width:100%;" />
					<br/>
					
					<label for="<?php echo $this->get_field_id( 'MidWeekTime' ); ?>"> Mid Week Time:</label>
					<input id="<?php echo $this->get_field_id( 'MidWeekTime' ); ?>" name="<?php echo $this->get_field_name( 'MidWeekTime' ); ?>" value="<?php echo $instance['MidWeekTime']; ?>" style="width:100%;" />
					<br/>
					<br/>
					
					<label for="<?php echo $this->get_field_id( 'ExtraMessage' ); ?>"> Extra Message:</label>
					<input id="<?php echo $this->get_field_id( 'ExtraMessage' ); ?>" name="<?php echo $this->get_field_name( 'ExtraMessage' ); ?>" value="<?php echo $instance['ExtraMessage']; ?>" style="width:100%;" />
					<br/>
			<?php
	}

Here is the file to download and install:Sunday Widget