all-in-one-event-calendar/public/admin/settings.php

<div class="wrap">

    <h2><?php echo $title; ?></h2>

    <div id="poststuff">

        <form method="post" action="" enctype="multipart/form-data">
            <?php wp_nonce_field( 'closedpostboxes', 'closedpostboxesnonce', false ); ?>
            <?php wp_nonce_field( 'meta-box-order', 'meta-box-order-nonce', false ); ?>

            <div class="metabox-holder">
                <div class="post-box-container column-1-ai1ec left-side timely">
                    <?php do_meta_boxes( $settings_page, 'left', null ); ?>
                    <?php
                        // Show the submit button only in the settings page and not in the Feeds page.
                        if ( $calendar_settings ) {
                            submit_button( esc_attr__( 'Update Settings', AI1EC_PLUGIN_NAME ), 'primary', 'ai1ec_save_settings' );
                        }
                    ?>
                </div>
                <div class="post-box-container column-2-ai1ec right-side timely"><?php do_meta_boxes( $settings_page, 'right', null ); ?></div>
            </div>
        </form>

    </div><!-- #poststuff -->

</div><!-- .wrap -->