My XSLT Sheet is great except I am trying to combine a couple of columns for list view and cannot figure out how to rename one of the column title fields only from within the XSL Sheet. The Field I am trying to change in the xsl sheet is  <xsl:apply-templates select="udt:Fields[udt:FieldTitle='Begin Date']" /> - I would like to change it to Date(s). Anybody know how to do this? Here's the code:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:udt="DotNetNuke/UserDefinedTable" exclude-result-prefixes="udt">
<xsl:output method="xml" indent="yes" omit-xml-declaration="yes" />
<!--
This prefix is used to generate module specific query strings
Each querystring or form value that starts with udt_{ModuleId}_param 
will be added as parameter starting with param
-->
<xsl:variable name="prefix_param">udt_<xsl:value-of select="//udt:Context/udt:ModuleId" />_param</xsl:variable>
<xsl:param name="param_orderby" select="//udt:Fields[udt:UserDefinedFieldId=//udt:Context/udt:OrderBy]/udt:SortColumn" />
<xsl:param name="param_direction" select="//udt:Context/udt:OrderDirection" />
<!--wrong string would break stylesheet, so fallback to ascending if userinput is wrong-->
<xsl:variable name="orderDirection">
<xsl:choose>
<xsl:when test="$param_direction='descending'">
<xsl:text>descending</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>ascending</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="orderType">
<xsl:variable name="DataType" select="//udt:Fields[udt:SortColumn=$param_orderby]/udt:FieldType" />
<xsl:choose>
<xsl:when test="$DataType='Int32' or $DataType='Decimal' or $DataType='Currency'">number</xsl:when>
<xsl:otherwise>text</xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:template match="udt:Data" mode="list">
<tr class="Item">
<td class="EditLink">
<xsl:call-template name="EditLink" />
</td>
<td class="EventName">
<xsl:value-of select="udt:Event_x0020_Name" disable-output-escaping="yes" />
</td>
<td class="Address">
<xsl:value-of select="udt:Address" disable-output-escaping="yes" /> <xsl:value-of select="udt:City" disable-output-escaping="yes" />, <xsl:value-of select="udt:State" disable-output-escaping="yes" /> <xsl:value-of select="udt:Country" disable-output-escaping="yes" /></td>
<td class="DateSpan">
<xsl:value-of select="udt:Begin_x0020_Date_UDT_Value" disable-output-escaping="yes" /> - <xsl:value-of select="udt:End_x0020_Date_UDT_Value" disable-output-escaping="yes" /></td>
<td class="Website">
<xsl:value-of select="udt:Website" disable-output-escaping="yes" />
</td>
</tr>
</xsl:template>
<xsl:template match="/udt:UserDefinedTable">
<xsl:variable name="currentData" select="udt:Data" />
<xsl:if test="$currentData">
<table class="Itinerary">
<!-- DEFINE ANY HEADERS HERE, EXAMPLE IS FOR TABLE TYPE LISTING -->
<!-- Parameter header is optional! -->
<!--
<tr>
<td/>
<td class="NormalBold UDT_Table_Head">
<xsl:apply-templates select ="udt:Fields[udt:FieldTitle='NameOfColumn']">
<xsl:with-param name ="header" select ="NewHeaderName"/>
</xsl:apply-templates>
</td>...
</tr>
-->
<tr class="Header">
<td>
<xsl:call-template name="EditLink" />
</td>
<td>
<xsl:apply-templates select="udt:Fields[udt:FieldTitle='Event Name']" />
</td>
<td>
<xsl:apply-templates select="udt:Fields[udt:FieldTitle='Address']" />
</td>
<td>
<xsl:apply-templates select="udt:Fields[udt:FieldTitle='Begin Date']" />
</td>
<td>
<xsl:apply-templates select="udt:Fields[udt:FieldTitle='Website']" />
</td>
</tr>
<xsl:apply-templates select="$currentData" mode="list">
<xsl:sort select="*[name()=$param_orderby]" order="{$orderDirection}" data-type="{$orderType}" />
</xsl:apply-templates>
</table>
</xsl:if>
</xsl:template>
<xsl:template match="udt:Fields" name="SortingHeader">
<xsl:param name="header" select="udt:FieldTitle" />
<xsl:if test="udt:Visible='true' or udt:Visible='True'">
<a>
<xsl:attribute name="href">
<xsl:choose>
<xsl:when test="udt:ValueColumn=$param_orderby">
<xsl:variable name="flippedDirection">
<xsl:choose>
<xsl:when test="$orderDirection='ascending'">
<xsl:text>descending</xsl:text>
</xsl:when>
<xsl:otherwise>
<xsl:text>ascending</xsl:text>
</xsl:otherwise>
</xsl:choose>
</xsl:variable>
?<xsl:value-of select="$prefix_param" />_orderby=<xsl:value-of select="udt:ValueColumn" />&amp;<xsl:value-of select="$prefix_param" />_direction=<xsl:value-of select="$flippedDirection" /></xsl:when>
<xsl:otherwise>
?<xsl:value-of select="$prefix_param" />_orderby=<xsl:value-of select="udt:ValueColumn" />&amp;<xsl:value-of select="$prefix_param" />_direction=<xsl:value-of select="$orderDirection" /></xsl:otherwise>
</xsl:choose>
</xsl:attribute>
<!--flipped order direction-->
<xsl:value-of select="$header" />
<xsl:if test="udt:ValueColumn=$param_orderby">
<img src="{//udt:Context/udt:ApplicationPath}/images/sort{$orderDirection}.gif" border="0" />
</xsl:if>
</a>
</xsl:if>
</xsl:template>
<xsl:template name="EditLink">
<xsl:if test="udt:EditLink">
<a href="{udt:EditLink}">
<img border="0" alt="edit" src="{//udt:Context/udt:ApplicationPath}/images/edit.gif" />
</a>
</xsl:if>
</xsl:template>
</xsl:stylesheet>

Stefan,

Thank you for your quick reply and your expertise. I changed the code accordingly to try out your solution and I received the following message causing me to be unable to save the xslt sheet. Any thoughts or ideas? 

Here's the message I got: 
The Template is not well-formed:
The 'xsl:otherwise' start tag on line 111 does not match the end tag of 'xsl:choose'. Line 112, position 3.

Great Stefan, plugged everything in, added the / on the closing , removed the brackets around [$header='Begin Date'] and it works like a charm. I have one more question regarding the begin date. How would I go about omitting an entire row if it is not equal to or greater than today's date?