Brian.. Lighting is huge!!!
How many times do you go to an wedding and they have no lights!! It frustrates the heck out of me.
You're selling the lights.. your selling the memory of a vision that will stay in all the guests minds of one of the best weddings they have been to in a long time!
Aside from the stage lighting, the lighting can also convert to club dance lighting for the party.
And when it gets dark you will have the fixtures to keep the ambient lighting down and have really good color lighting.
But your most important tool will be pictures.. you will need to take some really good pictures to show your customers the with and without lights look.