My idea, to get more people to the final(I do realise it would damaged the pitch and Man U would probably say no... but)
Maybe the Championship Final, Women's Super League (in that order) should be played at Old Trafford as a curtain raisers for the Grand Final. Also, all amateur kids club should receive discounted group tickets (which I'm sure they already do to some degree)
And Finally, play the Grand Final on the same day as the NRL final... and make it a festival type atmosphere with beer gardens, meet former players, live NRL GF action on the Big screen and while 2 extra games (Women's GF and the Million Pound Game) are being played inside the staduim. Almost a Magic Weekend feel about it.
We can market/name it as the Super league's "The Grand Day Out"