All true what you said. However there is an ever so slight difference about what I meant though. I assume you are talking about purely community-lead and organized tournaments? They are super cool ofc and can carry a game really far, but can the devs use community organized events when the game launches as advertising the game for example, or does all critics who review the game take account the community events when reviewing the game?
This is used to market the game starting at launch, in advertising and trailers etc. There could be an option in the game's main menu "Competitive race" or similar (which also reminds you every time that there are these tournaments available when you are in the menu and possibly tells you the time when they are if you try to select it), which is active only when the race is on. The races are for example saturday or sunday evenings. If you want to participate, only thing you need to do is to fire up the game and click that menu item in the certain time window. Well this was just my imagination, but I hope that you get what I mean here. Many games have communities that organize events, but does people know about it enough that everybody finds it that are potentially interested, and those that find it, are they capable of committing to the community (often times on some level required) and do they have time/interest/possibility/etc to come to teamspeak, connect to discord or chat and generally participate in organizing of the whole thing on some level (especially if you haven't got accounts or the software already) etc all these kind of things. I guess a purely community-organized tournaments would do the same thing if they are organized well enough and advertised enough and the treshold to enter is low enough. I don't know if I am making any sense here with my thought-flow-blabbering but I guess my points are:
1)integrate the tournaments directly in the game so that they are as easy as possible to participate and remind people about it in-game so it doesn't become only "the elite's" or a separate community's thing
2)some kind of in-game prizes (important nowadays
3)use these events in marketing and advertising the game starting at launch and to keep the playerbase interested&committed etc.