The site navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
Note: If you are hosting an event that will involve one or more foreign teams, there are additional requirements from US Soccer. See https://www.ussoccer.com/federation-services/youth-permission-travel-hosting/about for more information and for a list of forms that they require.