Over the years a great many clubs and groups have developed and for a long while they had little or no access to the Internet. This web-site offered the facility of a page of their own and many later built web-sites of their own. This web-site has been running a long while now and his risen very high in Google so is very easy to find and gets a high visitor rate. Those clubs and groups who wished to were then able to retain their space here and use it to link to their own sites. In the process the pages here have reduced but retain their links.
While the above was going on other groups organising major events grew to the point that they deserved and got, sections of their own reached not from here but from the navigation buttons on the Home page.