the code to create the session is:
if (1 == 1) {
$_SESSION["WADbSearch1_events_Results"]=$WADbSearch1->whereClause;
}
the name of the session being created is "WADbSearch1_events_Results". So the code to unset it is:
<?php
if (!session_id()) session_start();
if (isset($_SESSION["WADbSearch1_events_Results"])) unset($_SESSION["WADbSearch1_events_Results"]);
?>