Query in a query: Solved

// Query the database for all posts where $event_venue matches the venue of the current post

    <?php $the_query = new WP_Query( array( 'meta_key' => 'event_venue', 'meta_value' => $mix_venue ) );


            while ( $the_query->have_posts() ) :
            $the_query->the_post(); ?>
            <h2 class="entry-title"><a href="<?php the_permalink(); ?>" title="<?php echo esc_attr( sprintf( __( 'Permalink to %s', 'twentyten' ), the_title_attribute( 'echo=0' ) ) ); ?>" rel="bookmark"><?php the_title(); ?></a></h2>
            <?php endwhile;

            // Restore original Query & Post Data
            wp_reset_query();
            wp_reset_postdata();


            ?>