Let me point you here, a thread in Magic General for the announcement of various events. (It's sparsely used, but feel free, the thread was designed for that purpose.)
I would recommend the Official Event Announcements thread in Magic General. Just post up a notice about your tournament and the mods should delete the post after the tournament is over.
Edit: From a former Magic General mod to a current one: Bah! Sarnath'd!
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Edit: From a former Magic General mod to a current one: Bah! Sarnath'd!
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