Get post by ASC from custome field DATE picker

So what you need to do is order it by the custom value of the meta_key date value.

Something like this (untested):

$wp_query = new WP_Query( array(
    'post_type' => 'upcoming_events',
    'order' => 'ASC',
    'meta_query' => array (
        array (
            'key' => 'your_custom_date_key',
            'value' => date('Y-m-d')
            )
        ),
    'orderby' => 'meta_value'
    )
    );

Hope that helps.