Who can create a tournament? If a subscriber can create a tournament, how is it done?
I see you are not in any clans or clubs as mentioned below.
Another way would be to suggest a privately run tournament on this forum stating the conditions(time limits etc).
The participants would then have to "set up" their own games via the open invites option.
You, as tournament organiser would then have to keep records on a spreadsheet and ask the players to report the results of their games to you via pm.
It is quite involved to do it this way.
I once organised a clan knockout competition in this way.
The greatest difficulty was getting those who said they would participate to set up their games but once that was done it worked quite well.