This was really getting me for awhile... How to get the next recurrence of an event that uses the PDCalendar package. Well, here it is:

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>

<xsl:stylesheet 

version="1.0" 

xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 

xmlns:msxml="urn:schemas-microsoft-com:xslt"

xmlns:exslt="urn:Exslt.ExsltCommon"

xmlns:date="urn:Exslt.ExsltDatesAndTimes"

xmlns:umbraco.library="urn:umbraco.library"

xmlns:pdcalendar ="urn:pdcalendar"

exclude-result-prefixes="msxml exslt date umbraco.library pdcalendar">

<xsl:output method="xml" omit-xml-declaration="yes"/>

<xsl:variable name="messages" select="pdcalendar:GenerateDates('2009-1-1','2012-12-31','eventDate')" />

<xsl:param name="currentPage"/>

<xsl:param name="eventID" select="/macro/eventID"/>

<xsl:template match="/">

<xsl:for-each select="$messages/node[child::*/@id=$eventID][1]">

<xsl:if test="count(.) &gt; 0">

<xsl:value-of select="umbraco.library:LongDate(@date)"/>

</xsl:if>

</xsl:for-each>

</xsl:template>

</xsl:stylesheet>