audio and other question
 

I am going to shoot a wedding this sat on my canon xl2, its going to be an outside wedding, my only thing is the only mic i have is my on camera mic. Now last sep i shot an outdoor wedding with only the on camera mic and they absolutely loved it, but wouldn't it be beneficial to have some other mic like a lav or something?

now what frame rate to i shoot this in, i was thinking since the camera will be stablized on the tripod i could use the 24f so it will have a movie-like atmosphere to it, should i shoot in 60i or 30p

another question is i only have a crappy little light on my camera that really is no good and when i shoot the reception if it gets dark while i'm still shooting how can i get the best quality lighting where they still can see the footage?

Thank you