Well, we have a very narrow selection... it could only be an official chess.com tournament. Presumably, they've got bigger each time, though I don't actually know...
Trivia - What Chess.com touranment had the greatest number of participants?
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Ok, I've found out the answer, it's this one:
http://www.chess.com/tournament/1st-chesscom-tournament-1401-1800
And that's only because the categories were bigger back then. The tournament is still ongoing.
Sorry, I don't know the answer. I hoped someone from Chess.com would answer the question. I am also interested in knowing a little bit about that tournament; is it still going? who were the top finishers? Thanks!