Riot do an amazing job at promoting their content through all sorts of different mediums. Including mini-sites; independent League News websites & Youtube channels; Animations/ reveal trailers; arguably these very Boards as well and most notably the home page of the client itself. One would have to be a drooling monkey (or they just don't play League often) not to find the Universe site and all it's content, especially after these last 14 months.
Anyone that is somehow still ignorant to that content is unlikely to have ever cared to go looking for it in the first place.