Idea to give dominion (+Riot maybe) some publicity
The idea is something that Riot (somewhat) does several times a year already. They have show matches with some of the LCS teams for the various special game modes (URF, Hexakill, DoomBots) or a mode just for that game (DMC vs. Nox). Whenever they hold these show matches the number of people playing that mode seems to increase afterward, people watch the pros play it and then want play as well.
So why not do this for dominion? It seems like it would be fairy simple to have a show match with LCS teams in dominion, since Riot already does that exact thing with other game modes. Riot could even use it to gain a bit of publicity for themselves and give to the community, which is something they and many LCS teams already do. I've seen many other tournaments in which a few teams come together and have a short tournament over 1 or 2 days with each team representing a charity of their choice. Instead of the winning team claiming the prize money for themselves, the people putting on the tournament donate that money to the charity which was represented by the winning team. By holding a dominion tournament with a few LCS teams Riot and dominion would get publicity and love, as well as Riot and the LCS teams being able to do some fun charity work and give back to their communities.