$day = date('j');
$mon = date('n');
$yr = date('Y');

$a = 0;
while ($a <= ($day+27)) {
    $mktime = mktime(0,0,0, $mon, $day+$a, $yr);
    if (date('w', $mktime) == 2 || date('w', $mktime) == 3 || date('w', $mktime) == 4) {
        $dates[] = date('l, F d, Y', $mktime);
    }
    $a++;
}