JIP
No longer a newbie, moving up!
This is why I say 400 and a good pro emulsion.My advice. Obviously the wedding party can't afford a professional and there is nothing wrong w/that. Do your best to get as many decently exposed photos of your friends/family enjoying themselves and they will be ever so grateful. I think if you just capture some "moments" for them, that can help them enjoy the memories then you will have done your job tenfold. Good luck.
have a good one
3Eo