I'd list it under "snape_potter" since that's an umbrella category. Though after this month Snarry-a-thon posts will all be posted by "snarryathonmod" rather than "spfestmod". It should be now, but I am too lazy to log out of one mod account and into another and since they're both me at the same comm, I figure either work.
And YAY for pimping! There can never be too much Snarry! ;D