Hi there folks, I do not know if this idea has been thrown about before, but as the site now appears to be gaining popularity and has hundreds of users login each day and considering TF2 Center lobbies are considered the most simple way to implement people into competitive TF2 formats, why not implement a Sidebar, similar to the Reddit TF2 model that allows users to find competitive TF2 leagues for their regions?
With the current layout, it is probably better to be put at the top, but something like this would be great for newer users to competitive TF2 who want to play in a competitive league and are wondering where to go. Also some form announcement section promoting when signups begin for each competitive event would be great as well. You do not need to be responsible for updating this, rather the competitive league themselves contact you and ask you to promote themselves and you merely update the information in the bar.
Let me know what you think, I have been involved in competitive leagues and tournaments for a long time and I am happy to answer any sort of questions or liaise on your behalf if you have any doubts. In terms of TF2 Center development, ultimately I think this would be more beneficial to competitive leagues as well as users on your website become more aware of the full extend of what competitive scene in terms of organised competition. It does certainly open up more opportunities to partner with leagues and competitive communities to help grow the playerbase for both websites.