Hmm. Sorry for everything happened mostly to your fiance's uncle. Personally, I'm not into superstitious belief but as the old ones said, "There's no loss if you'll follow and believe."
In your case, I guess there's nothing wrong to walk through the aisle this year. Just a hard prayer of both of you with the help of your families, everything will be fine. I suggest, If you guys don't feel a positive luck due to the tragedies happened, just re-schedule the wedding. As long as you two are inlove with each other, you can settle anytime anywhere in God's will. He has a good plan for you surely.
Keep smiling and Congratulations in advance! :)