One week until the Dark Chess and Extinction Chess tournaments will get going. Looks like there'll be a couple sections, maybe three in the Dark Chess one.

I have a question concerning the organizing of tournaments. Is it better to have large sections of eight people, or small ones of four or five? I suppose the answer depends on what I mean by "better", but I've noticed that a lot of tournaments are set for sections of four or five people. I tend to think it's better to have as many people play at once, but it does mean there's less winners available for a later round if you only start with a few sections. 24 people into 3 sections of 8, or 6 sections of 4. It'd be kind of nice if the organizer could set the sections based on the actual number of entrants as opposed to having it set in stone, or can I change the section size before starting the tournaments?