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For upcoming plans just hit the "count me out" button in the right-hand corner of the plan page.
For past plans (the "been there, done that" section), this option currently isn't available. We did this to avoid confusing people with the option to count themselves in/out when the event had already happened. We're considering adding at least the "count me out" feature for situations such as this.
In the meantime, which past plans would you like to remove from your profile? I'll see if I can take care of those for you.