Having never planned a wedding... I don't really have much tips there However I just wanted to offer some hugs and support. I'm sure your mom is looking down on you/all around you [insert your afterlife belief system here]... and just beaming with pride and happiness for you.
Maybe you can do a nice tribute to her at the wedding? My aunt died a few years ago (pancreatic cancer too, actually), and less than a year later my cousin got married. They lit some candles at the ceremony and had a nice table with flowers and candles and her picture on it, just as kind of a reminder that she WAS there. It was really beautiful.