Thanks for the advice.
I have not used my 55-300mm lens much, though I can see the use of not having to get close. Most of the weddings I have been to in the past have not had the best light, and with the f4.0 aperture at 55mm I did not think that i get many shots that did not have a really high ISO.
Personally do not want to be carrying more than 1 extra lens so that I don't lose or damage them. I have a lowpro bag but that seems too bulky for a crowded reception hall.
I'm not sure that the carrying 2 primes be useful unless I had one on another body, which I don't have anyway. The other thing about that is I hope that I will not find it necessary to change the lens much.
Ideally I'd like to stay with just one lens, force myself to adapt. But the point of doing this is not just for me. I want to provide a nice set of photo's, maybe print the better ones into a small book for them.
While I am not new to photography, the Kx is my first DSLR. Sometimes what I think looks good after I take a shot and preview it, does not look so good when I bring them into LR4. (I still have a lot to learn)
As for having a flash diffuser, I looked up and found this one one amazon:
Amazon.com: Gary Fong Puffer Pop Up Flash Diffuser - CANON/NIKON: Camera & Photo
If anyone has a better suggestion, I am open to it. I need to order by Monday and the wedding is next weekend.
Thanks again for the advice.
Mort.