Add the "All" option to the list:
<option value="">All</option>
Then update the query:
$rsEVENTS->setQuery("SELECT TMSAevent.tmsaeventID, TMSAevent.tmsaeventtypeID, TMSAevent.tmsaevent, TMSAevent.tmsastartdate, TMSAevent.tmsaenddate, TMSAevent.tmsavenueID, TMSAevent.tmsaeventsummary, TMSAevent.tmsaeventdesc, TMSAevent.tmsaeventDELETE, TMSAevent.tmsaeventPHONE, TMSAevent.tmsaeventEMAIL, TMSAevent.tmsaeventWEB, TMSAvenues.tmsavenuename, TMSAvenues.tmsaorgname, TMSAvenues.tmsavenuecontactname, TMSAvenues.tmsavenueaddress, TMSAvenues.tmsavenuetown, TMSAvenues.tmsavenuepostcode, TMSAcountry.tmsacountry, TMSAregions.tmsaregion FROM TMSAevent INNER JOIN TMSAvenues ON TMSAevent.tmsavenueID = TMSAvenues.tmsavenueID INNER JOIN TMSAcountry ON TMSAvenues.tmsacountryID = TMSAcountry.tmsacountryID INNER JOIN TMSAregions ON TMSAvenues.tmsaregionID = TMSAregions.tmsaregionID WHERE TMSAevent.tmsaeventtypeID = ? AND TMSAevent.tmsastartdate >= ? AND TMSAevent.tmsaeventDELETE = 2 AND ((TMSAevent.tmsaevent LIKE ? OR TMSAevent.tmsaeventsummary LIKE ? OR TMSAevent.tmsaeventdesc LIKE ? OR TMSAvenues.tmsavenuename LIKE ? OR TMSAvenues.tmsaorgname LIKE ? OR TMSAvenues.tmsavenuecontactname LIKE ? OR TMSAvenues.tmsavenueaddress LIKE ? OR TMSAvenues.tmsavenuetown LIKE ? OR TMSAcountry.tmsacountry LIKE ? OR TMSAregions.tmsaregion LIKE ?) OR ? = '') ORDER BY TMSAevent.tmsastartdate ASC");
And add the parameter one last time to the end of the parameter list:
$rsEVENTS->bindParam("c", "".(isset($_POST['searchKEYWORD'])?$_POST['searchKEYWORD']:"") ."", ""); //WAQB_Param13