Best Practice For Retiring RSS Feeds?

GBJ writes "I work for an organisation that runs seasonal online competition events. Each event has its own news feed which becomes obsolete shortly after the event finishes. We're still getting RSS requests for some events as far back as 2004. I'd like to close a few thousand old feeds and remove the resource hit they cause, but I'm not sure what is the best approach. Currently I'm considering just returning a 404, but I have no idea if there is a better way to handle this. Uncle Google hasn't turned anything up yet, but sometimes it's hard to find something when you don't know what it's called ..."http://developers.slashdot.org/slash.../03/17/1316258
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