List all tournaments or create a new tournament.

GET /api/v1/tournaments/?format=api&ordering=-exclude_provisional&page=5857
HTTP 200 OK
Allow: GET, POST, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

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                "username": "dexonsmith",
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        {
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            "name": "Celebrating the Winter Solstice - Live 19x19 Swiss Tournament 2024-12-22 11:00",
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