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Editing: upcoming-events.php

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<?php

class Jetpack_Upcoming_Events_Widget extends WP_Widget {
	function __construct() {
		parent::__construct(
			'upcoming_events_widget',
			/** This filter is documented in modules/widgets/facebook-likebox.php */
			apply_filters( 'jetpack_widget_name', __( 'Upcoming Events', 'jetpack' ) ),
			array(
				'description' => __( 'Display upcoming events from an iCalendar feed.', 'jetpack' ),
				'customize_selective_refresh' => true,
			)
		);
		if ( is_active_widget( false, false, $this->id_base ) ) {
			add_action( 'wp_head', array( $this, 'css' ) );
		}
	}

function css() {
?>
<style type="text/css">
.upcoming-events li {
	margin-bottom: 10px;
}
.upcoming-events li span {
	display: block;
}
</style>
<?php
	}

function form( $instance ) {
		$defaults = array(
			'title' => __( 'Upcoming Events', 'jetpack' ),
			'feed-url' => '',
			'count' => 3
		);
		$instance = array_merge( $defaults, (array) $instance );
?>

<p>
		<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:', 'jetpack' ); ?></label>
		<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>" />
		</p>

<p>
		<label for="<?php echo $this->get_field_id( 'feed-url' ); ?>"><?php _e( 'iCalendar Feed URL:', 'jetpack' ); ?></label>
		<input class="widefat" id="<?php echo $this->get_field_id( 'feed-url' ); ?>" name="<?php echo $this->get_field_name( 'feed-url' ); ?>" type="text" value="<?php echo esc_attr( $instance['feed-url'] ); ?>" />
		</p>

<p>
		<label for="<?php echo $this->get_field_id( 'count' ); ?>"><?php _e( 'Items to show:', 'jetpack' ); ?></label>
		<select id="<?php echo $this->get_field_id( 'count' ); ?>" name="<?php echo $this->get_field_name( 'count' ); ?>">
			<?php $i = 1;
			while ( $i <= 10 ) { ?>
				<option <?php selected( $instance['count'], $i ) ?>><?php echo $i; ?></option>
			<?php $i++; } ?>
			<option value="0" <?php selected( $instance['count'], 0 ) ?>><?php _e( 'All' , 'jetpack' ) ?></option>
		</select>
		</p>
<?php
	}

function update( $new_instance, $old_instance ) {
		$instance['title'] = strip_tags( $new_instance['title'] );
		$instance['feed-url'] = strip_tags( $new_instance['feed-url'] );
		$instance['count'] = min( absint( $new_instance['count'] ), 10 ); // 10 or less
		return $instance;
	}

function widget( $args, $instance ) {
		jetpack_require_lib( 'icalendar-reader' );

$ical = new iCalendarReader();
		$events = $ical->get_events( $instance['feed-url'], $instance['count'] );
		$events = $this->apply_timezone_offset( $events );
		$ical->timezone = null;

echo $args['before_widget'];
		if ( ! empty( $instance['title'] ) ) {
			echo $args['before_title'];
			echo esc_html( $instance['title'] );
			echo $args['after_title'];
		}

if ( ! $events ) : // nothing to display?
?>
			<p><?php echo __( 'No upcoming events', 'jetpack' ) ?></p>
<?php
		else :
?>
			<ul class="upcoming-events">
				<?php foreach ( $events as $event ) : ?>
				<li>
					<strong class="event-summary"><?php echo $ical->escape( stripslashes( $event['SUMMARY'] ) ); ?></strong>
					<span class="event-when"><?php echo $ical->formatted_date( $event ); ?></span>
					<?php if ( ! empty( $event['LOCATION'] ) ) : ?>
						<span class="event-location"><?php echo $ical->escape( stripslashes( $event['LOCATION'] ) ); ?></span>
					<?php endif; ?>
					<?php if ( ! empty( $event['DESCRIPTION'] ) ) : ?>
						<span class="event-description"><?php echo wp_trim_words( $ical->escape( stripcslashes( $event['DESCRIPTION'] ) ) ); ?></span>
					<?php endif; ?>
				</li>
				<?php endforeach; ?>
			</ul>
<?php
		endif;

echo $args['after_widget'];

/** This action is documented in modules/widgets/gravatar-profile.php */
		do_action( 'jetpack_stats_extra', 'widget_view', 'grofile' );
	}

// Left this function here for backward compatibility
	// just incase a site using jetpack is also using this function
	function apply_timezone_offset( $events ) {
		jetpack_require_lib( 'icalendar-reader' );

$ical = new iCalendarReader();
		return $ical->apply_timezone_offset( $events );
	}
}

function upcoming_events_register_widgets() {
	register_widget( 'Jetpack_Upcoming_Events_Widget' );
}

add_action( 'widgets_init', 'upcoming_events_register_widgets' );

Editing: upcoming-events.php

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