We have two sets of friends getting married over the next two weekends. Sergio and I tried to come up with some hard-earned advice on marriage, however, we didn't manage anything more than two bathrooms in one home makes life better. This is not really useful to our friends, who probably have two or even more bathrooms in their homes.
So, have fun at the wedding, eat something, and if anything goes wrong just let it go. Even if your calla lilies arrive as daisies, or your beef appears as pork, the unity candle refuses to light, or your best man passes out, at the end of the day you will still be married and heading for an exotic vacation. That is the point, after all.