I'm a professional wedding planner, and I've seen plenty of bad guest behavior at events. AdvertisementIn my years as a professional wedding planner, I've learned a thing or two about the people who attend my events. Here are the most common mistakes I see wedding guests make, and how to avoid them. AdvertisementWhen you refuse to RSVP, you force the couple to track down the information when they're already way too busy trying to plan their wedding. Alex Gukalov/ShutterstockIt never fails to amaze me what a wedding guest will leave out for anyone to grab — purses, cell phones, credit cards.

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