custom atrributes-public.php template

<?php
 /*
   - hide selected attribute from showing in public event submission form
   - using template forms/event/atrributes-public.php
  */
?>
<?php
/*
 * This file is called by templates/forms/event-editor.php to display attribute fields on your event form on your website.
* You can override this file by copying it to /wp-content/themes/yourtheme/plugins/events-manager/forms/event/ and editing it there.
*/
global $EM_Event;
/* @var $EM_Event EM_Event */
$attributes = em_get_attributes();
$has_depreciated = false;
?>
<?php if( count( $attributes['names'] ) > 0 ) : ?>
	<?php foreach( $attributes['names'] as $name) : ?>

	$hide = array('att1','att2); //attribute name you've wanted to hide

	if ( !in_array($name,$hide) ):

		<div class="event-attributes">
			<label for="em_attributes[<?php echo $name ?>]"><?php echo $name ?></label>
			<?php if( count($attributes['values'][$name]) > 1 ): ?>
			<select name="em_attributes[<?php echo $name ?>]">
				<?php foreach($attributes['values'][$name] as $attribute_val): ?>
					<?php if( is_array($EM_Event->event_attributes) && array_key_exists($name, $EM_Event->event_attributes) && $EM_Event->event_attributes[$name]==$attribute_val ): ?>
						<option selected="selected"><?php echo $attribute_val; ?></option>
					<?php else: ?>
						<option><?php echo $attribute_val; ?></option>
					<?php endif; ?>
				<?php endforeach; ?>
			</select>
			<?php else: ?>
			<?php $default_value = (!empty($attributes['values'][$name][0])) ? $attributes['values'][$name][0]:''; ?>
			<input type="text" name="em_attributes[<?php echo $name ?>]" value="<?php echo array_key_exists($name, $EM_Event->event_attributes) ? esc_attr($EM_Event->event_attributes[$name], ENT_QUOTES):''; ?>" value="<?php echo $default_value; ?>" />
			<?php endif; ?>
		</div>

	endif;


	<?php endforeach; ?>
<?php endif; ?>