Preparing to write the new Events feed page requested by BLT, I first set about fixing a bunch of errors in the existing code:

• The RSS reader class (includes/rssReaderManyDepts.php) function writeOutTitle() did not echo open <li> and close </li> tags around its content, although it is called in the context of a <ul> tag. Added the appropriate tags, and also commented out <br/> tags which were being used to space the content.
• The RSS reader class (includes/rssReaderManyDepts.php) function writeOutEvent() echoed out two <br/>s and an <hr/> after closing the <li> tag; this obviously was invalid, so I've moved them inside the <li> tag.
• <includes/rightColumn.inc> had two elements with the same id attribute (rightCol_1). I changed the second to rightCol_1a.
• <includes/rightColumn.inc> had an unclosed <ul> (in rightCol_2). That's now closed.

Pages now validate, so I can move on to the new events output page.