Can I add specific urls to robots.txt to stop google indexing them?

I have a website that lists hundreds of events (football matches, car boot sales, tribute nights etc). When the events expire is there a way using the robots.txt that they can automatically be hidden from search engines?

 

I'm assuming you are using a database to track the event status
I also assume that when the event is expired you change a value in the database(for example active = false)
Pseudo-code for this:

if event is not active
write new line to robots.txt with text "Disallow: /event/id/"

Or something like that, if you ask a php developer he could probably whip you up a script like that in an hour or less.

 

yes sure you can add specific URLs to stop Google indexing them
Use this string >
Disallow: / URL