Set the camera to Program mode it will be your P&S camera. And yes, bring a smaller value for events as there might be many people in the picture and you got limited space in wedding reception dinner area.

You can always start playing around like 1-2 hours before the wedding reception starts, so that you know what F/value and shutter speed to use. I'd suggest you stick to maximum of 400 ISO value as higher value will tarnish your hard work.

EDIT: I wouldn't worry much about the lighting as there are software that can tweak the color; namely picasa, lightroom and many more. Of course the result will not be as nice as taking a picture under a normal light but you gonna take what you can salvage.

This post has been edited by Belphegor: Jan 8 2015, 08:56 AM

ISO800 still okay but ISO1600 is quite noisy for some certain cameras. Of course I cannot judge on EPL-1 as I do not own them. Furthermore, we do not know what kind of venue does the wedding reception dinner is going to take place. Could be in a ballroom, or a well-lit hallway, or even a poorly-lit area.

@8066, may I know what kind of pictures you will be shooting in general? candid shots or still shots?

This post has been edited by Belphegor: Jan 8 2015, 10:13 AM