This describes how you can convert an XML file to a simple HTML table. The table can then be copy/pasted into a Google Sheet for example for further manipulation.
brew install saxon
saxon -s:input.xml -xsl:stylesheet.xsl -o:result.html
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<html>
<body>
<table>
<tr>
<th>url</th>
<th>event_date</th>
</tr>
<xsl:for-each select="rss/channel/item">
<tr>
<td><xsl:value-of select="link" /></td>
<td><xsl:value-of select="event_date" /></td>
</tr>
</xsl:for-each>
</table>
</body>
</html>
</xsl:template>
</xsl:stylesheet>