front-end-event-creation.php

<?php
/**
 * This is a basic example of implementing front end creation of events with Event Organiser
 * @see http://www.stephenharris.info/2012/front-end-event-posting/
 * @see http://wordpress.org/extend/plugins/event-organiser/
 *
*/
add_shortcode('my_event_form','my_event_form_shortcode_handler');

function my_event_form_shortcode_handler( ){

	if( !is_user_logged_in() ){
		return '<p> Only logged in users can post events </p>'; 
	}

	$html = '<form method="POST">';

	//Create hidden 'action' field and corresponding nonce
	$html .= '<input type="hidden"	name="my-action" value="post-event" >';
	$html .=wp_nonce_field( 'post-event', '_mynonce',false,false);

	//Event Title
	$html .= sprintf('<p><label for="my-frontend-event-%1$s"> %2$s
				<input type="text" name="my_frontend_event[%1$s]" id="my-frontend-event-%1$s" >
			</label></p>',
			'title',
			'Event Title'
		);

	//Event Description
	$html .= sprintf('<p><label for="my-frontend-event-%1$s"> %2$s
				<textarea name="my_frontend_event[%1$s]" id="my-frontend-event-%1$s"></textarea>
			</label></p>',
			'description',
			'Event Description'
		);

	//Start date
	$html .= sprintf('<p><label for="my-frontend-event-%1$s"> %2$s
				<input type="text" name="my_frontend_event[%1$s]" id="my-frontend-event-%1$s" class="my-frontend-event-datepicker" >
			</label></p>',
			'startdate',
			'Start Date'
		);

	//End date
	$html .= sprintf('<p><label for="my-frontend-event-%1$s"> %2$s
				<input type="text" name="my_frontend_event[%1$s]" id="my-frontend-event-%1$s" class="my-frontend-event-datepicker" >
			</label></p>',
			'enddate',
			'End Date'
		);

	//Venue
	$html .= sprintf('<p><label for="my-frontend-event-%1$s"> %2$s %3$s </label></p>',
				'venue',
				'Venue',
				wp_dropdown_categories(array(
					'orderby'            => 'ID', 
					'order'              => 'ASC',
					'hide_empty'         => 0, 
					'echo'               => 0,
					'id'=>'my-frontend-event-venue',
					'name'               => 'my_frontend_event[venue]',
					'taxonomy'           => 'event-venue'
				))
			);

	//Category - checklist
	$cats = get_terms('event-category',array('hide_empty'=>0));
	if( $cats ){
		$html .= '<p><label for="my-frontend-event-category">Category <ul>';
		foreach ( $cats as $cat ){
			$html .= sprintf('<li><label for="my-frontend-event-%1$s-%2$d">
									<input type="checkbox" name="my_frontend_event[%1$s][]" value="%2$s" id="my-frontend-event-%1$s-%2$d" >
									%3$s
								</label></li>',
					'category',
					$cat->term_id,
					esc_html($cat->name)
					);
		}
		$html .= '</label></p>';
	}


	//The post button
	$html .= '<p><input name="submit" type="submit" id="submit" value="Post Event"></p>';

	$html .='</form>';

	return $html;
}






add_action('init','my_frontend_event_post_listner');
function my_frontend_event_post_listner(){

	if( !isset($_POST['my-action']) || 'post-event' != $_POST['my-action'] )
		return;

	//Collect raw input
	$input = $_POST['my_frontend_event'];

	//Check user is logged in:
	if( !is_user_logged_in() )
		return;

	//Check nonce
	check_admin_referer( 'post-event',  '_mynonce');

	/*
	 * IMPORTANT: Perform any other checks you need to here (e.g. should only users with a certain capability be able to post events?)
	*/

	/**
	 * Set the post data (see http://codex.wordpress.org/Function_Reference/wp_insert_post)
	 * This includes event-category and event-venue (taxonomy terms)
	*/
	//Event venue is just an ID
	$event_venue = isset($input['venue']) ? (int) $input['venue'] : 0;
	
	//Event cats are an array of IDs
	$event_cats = !empty( $input['category'] ) ? $input['category'] : array();
	$event_cats = array_map( 'intval', $event_cats );

	$post_data =array(
		'post_title'=>$input['title'],
		'post_content'=>$input['description'],
		'tax_input'=>array(
			'event-venue'=>array($event_venue),
			'event-category'=>$event_cats,
		)
	);

	/**
	 * Set the event data
	*/
	//Start and end dates need to be given as DateTime objects (timezone is UTC unless a timezone is given)
	$start = new DateTime($input['startdate'],eo_get_blog_timezone());
	$end = new DateTime($input['enddate'],eo_get_blog_timezone());
	$event_data =array(
		'schedule' =>'once',  //specifies the reoccurrence pattern
		'all_day' =>  1, //1 if its an all day event, 0 if not - if not you'll need to specify a start/end time for the DateTimeobjects
		'start' =>  $start, //start date (of first occurrence)  as a datetime object
		'end' => $end,  //end date (of first occurrence)  as a datetime object
	);

	//Finally, Insert event.
	$post_id = eo_insert_event($post_data,$event_data);
}
?>

Hi @toitrinh can you post your code ?