As you are probably aware, the first wedding was performed by God himself in the Garden of Eden. The JW wedding is a simple ceremony fashioned after the verses in the Bible book of Genesis. There will be many scriptures quoted outlining the responsibilities of both the husband and the wife.
You should be aware that they dont throw rice at the end as this custom is of pagan origin, so dont bring any.
For most people the most striking difference is the nudity. The audience is not required to be nude, however understandably the bride and groom are, as the first bride and groom were. I would say that 75% of the time the wedding party is also nude, but that is not mandatory, only the bride and groom must be nude just as the first bride and groom were back in Eden.
Its actually a very lovely ceremony, Im sure you will enjoy it.
Freeman