Glad to hear you have it working.
The code you include in your message is incomplete, so it's pretty close to impossible to tell what the problem may have been, in the future, please compress the PHP page to a zip file to include the complete code.
one thing i see in your message, is that the to address is using a form element named "EmailAddy"
$RecipientEmail = "".$_POST["EmailAddy"] ."";include("WA_Universal_Email/WAUE_event_rego_1.php");
the you post the form field your testing with which does not have the same name, it is named "HName"
<input type="text" name="HName" value="" size="32" tabindex="4">
so perhaps the fix that worked was that you renamed that field or added another field named "EmailAddy"