Community Events 1.0.5 swap cat checkboxes for select (pt 2)

<?php
    $event_cat_ids = array();
    if ( $event ) {
        $event_cats = wp_get_object_terms( $event->ID, TribeEvents::TAXONOMY );
        foreach ( $event_cats as $event_cat ) {
            $event_cat_ids[] = $event_cat->term_id;
        }
    } else {
        $event_cats = array();
    }
    $args = array(
        'hide_empty' => false,
        'orderby' => 'name',
        'order' => 'ASC',
        'exclude' => $event_cat_ids,
    );

    $cats = get_terms( TribeEvents::TAXONOMY, $args );
    $cats = array_merge( $event_cats, $cats );
    $cats = apply_filters( 'tribe_community_events_event_categories', $cats );

    echo '<select name="tax_input[tribe_events_cat][]">';
    echo '<option> Select a category </option>';

    foreach ($cats as $cat)
        echo '<option value="'.esc_attr($cat->term_id).'">'.esc_html($cat->name).'</option>';

    echo '</select>';
?>