diff --git a/camp23-schedules/combine.sh b/camp23-schedules/combine.sh
new file mode 100755
index 0000000..0d2444c
--- /dev/null
+++ b/camp23-schedules/combine.sh
@@ -0,0 +1,5 @@
+#! /usr/bin/env bash
+
+set -e
+
+curl -s https://events.ccc.de/camp/2023/hub/api/c/camp23/schedule.xml | xsltproc fix.xsl -
diff --git a/camp23-schedules/fix.xsl b/camp23-schedules/fix.xsl
new file mode 100644
index 0000000..b58554a
--- /dev/null
+++ b/camp23-schedules/fix.xsl
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xsl:stylesheet
+    version="1.0"
+    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    exclude-result-prefixes="xsl xsi">
+
+  <xsl:output method="xml"
+	    version="1.0"
+            encoding="utf-8"
+            indent="yes"/>
+
+  <xsl:template match="/schedule">
+    <schedule>
+      <xsl:apply-templates/>
+    </schedule>
+  </xsl:template>
+  <xsl:template match="/schedule/day">
+    <day index="{@day}" date="{@date}" start="{@start}" end="{@end}">
+      <xsl:apply-templates/>
+    </day>
+  </xsl:template>
+  <xsl:template match="/schedule/day/room">
+    <room name="{@name}" guid="{@guid}">
+      <xsl:apply-templates/>
+    </room>
+  </xsl:template>
+  <xsl:template match="/schedule/day/room/event">
+    <event guid="{@guid}" id="{@id}">
+      <xsl:apply-templates/>
+    </event>
+  </xsl:template>
+  <xsl:template match="/schedule/day/room/event/duration">
+    <duration>
+      <xsl:variable name="minutes" select="substring-after(., ':')"/>
+      <xsl:choose>
+        <xsl:when test="contains($minutes, ':')">
+          <xsl:text>00:30</xsl:text>
+        </xsl:when>
+        <xsl:when test="number($minutes) &gt;= 60">
+          <xsl:value-of select="substring-before(., ':')"/>
+          <xsl:text>:</xsl:text>
+          <xsl:text>00</xsl:text>
+        </xsl:when>
+        <xsl:otherwise>
+          <xsl:value-of select="substring-before(., ':')"/>
+          <xsl:text>:</xsl:text>
+          <xsl:value-of select="$minutes"/>
+        </xsl:otherwise>
+      </xsl:choose>
+    </duration>
+  </xsl:template>
+
+  <xsl:template match="*">
+    <xsl:copy-of select="."/>
+  </xsl:template>
+</xsl:stylesheet>
diff --git a/default.nix b/default.nix
index 40d0f2b..a28b1d1 100644
--- a/default.nix
+++ b/default.nix
@@ -48,4 +48,6 @@ in {
   museen-dresden = wrapScript "museen-dresden" ./museen-dresden/scrape.rb;
   criticalmass = wrapScript "criticalmass" ./criticalmass/scrape.rb;
   kosmotique = wrapScript "kosmotique" ./kosmotique/scrape.rb;
+
+  cccamp23-schedules = ./camp23-schedules;
 }