$sqlsatnums = 511..1040;
foreach($sqlsatnum in $sqlsatnums)
{
    $page = Invoke-WebRequest -Uri "https://www.sqlsaturday.com/$sqlsatnum/Sessions/Schedule";
    $page.RawContent | Out-File -FilePath "C:\temp\sqlsatpages\sqlsaturday_$sqlsatnum`_schedule.html";
}