I think if you had a "challenge" tag by itself that got used only when you posted a new challenge but not on individual entries, that would work. So you could have a new challenge post announced, tagged "challenge, 087 - sacrosanct"
And when someone fills that challenge, it gets tagged with: "087 - sacrosanct"
As long as the tag is only going to get used on your challenge announcements, that works! Like over on sga_saturday I have an "admin" tag that only gets used on announcement posts (almost always new challenges), the challenge tag itself (like "week #336-339: missing") that gets used by everyone, and at the end of a challenge, I use the "admin" tag, the "week #336-339: missing" tag, and a specific end of challenge tag called "roundup".
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And when someone fills that challenge, it gets tagged with: "087 - sacrosanct"
As long as the tag is only going to get used on your challenge announcements, that works! Like over on
Make sense?