On My home there is the section called tracked activity.  How do I make something become untracked?  It's got to be there I just can't find it.

If you track a member, everytime they post it will show up in your "my tracked activity" . To undo this, remove them from your tracked list.

http://www.chess.com/home/alerts.html

The names of people you are tracking are at the bottom of the page, just click where it says "remove". 

I want to track my friends, I just don't want to keep tracking the announcement for a tournament that ended 2 months ago amoung other things.

A possible solution to the tournament problem.  Check whether you still have the option to withdraw?

TadDude wrote: A possible solution to the tournament problem.  Check whether you still have the option to withdraw?

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I've not entered the tournament and in any case its an announcement for an OTB tourney in the local area.  I get the info because I'm tracking my friends activity.

it will eventually get replaced by new tracked activity. you aren't getting New Comments on it, are you?

No just the original posting and a couple replies but the thread itself died awhile back.

ok. yeah. it will eventually drop off as new tracked items appear. but tracking is on a per-user event, not per item. new comment, however, are a per-item. its the only way to make it work.