Nagan-4
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January 4th to 7th. 1 round per day, playing from 10:00 to 24:00, some will finish quickly, others will play until the very end.
Since there are many players, we will use a Swiss-system tournament with 4 or possibly 5 rounds.
Playing doubles takes a long time. Most likely, the winner will have to win all matches.
For example, with 20 players: Round 1 - 10 winners, Round 2 - 5 winners, Round 3 - 2 or 3 winners, Round 4 - 1 or 2 winners. If there are 2 winners, there will be an additional, fifth round.