function tweakecp_add_jpshare( $after ) {

    if ( function_exists( 'sharing_display' ) ) {
        $shares = sharing_display( '', true );

        $assess = trim($shares);
        if ( empty($assess) ) $shares = ' sharing_display() is not returning anything ';
    }
    else {
        $shares = " Jetpack\'s sharing_display() function has not been defined ";
    }

    $after .= $shares;
    return $after;
}

add_filter( 'tribe_events_after_html', 'tweakecp_add_jpshare' );