I saw this information written by Nicole Harris on Martha Stewart Weddings and I had to reposot it. I work with alot of couple whose wedding is made a lot more stressful because of the reasons listed below and sadly alot of wedding guests dont see it as a big deal some of the things they do:
A bride and groom put lots of time, energy, and resources into planning a picture-perfect wedding. That's why guests should respect the couple (and the effort that put into their nuptials) by practicing stellar wedding etiquette and avoiding any major social faux pas. Not sure how to behave? If you're doing any of the ten things below, you may be unintentionally being a bad guest.
Not responding to the RSVP.
Everyone has a busy schedule, and sending back your wedding RSVP is something that might slip your mind, especially if you have to consult with your significant other or boss about the date. But RSVPing past deadline, or failing to respond at all, creates a stressful dilemma for the couple who need an accurate headcount for their vendors. Save them from having to call to inquire about whether or not you'll be there by promptly sending your response card.
Bringing an uninvited plus-one.
Thinking about bringing your new boyfriend to the celebration? Unless your invitation permitted indicated that you were invited with a plus-one, plan to ride solo for the night. There a variety of different reasons why a couple may not be able to accommodate an additional guest at their venue, or else they may have wanted to celebrate with only their nearest and dearest in attendance.
Not following the dress code.
If the invitation called for cocktail attire, don't show up in a formal floor-length gown. It's also rude to wear anything that's too flashy or revealing, no matter what the dress code is, as you'll draw attention away from the couple. And it should go without saying that a guest should never wear a white dress to a wedding, even if it's cocktail-length or covered in a pattern.
Drinking too much.
It's okay to indulge at the open bar, but don't go overboard. The bride and groom shouldn't have to deal with an unruly, disruptive, and overserved guest on their wedding day.
Complaining about anything.
The chicken dinner may taste extremely bland, but don't express your disapproval since those negative reviews may find their way back to the couple. The same rule goes for the rest of the wedding's details, like the décor, reception music, and venue—if you don't have anything nice to say, don't say anything at all.
Constantly pulling out your phone.
Snapping a few pictures at the reception isn't a problem, but being glued to a screen during the ceremony is rude, especially if the couple has indicated they'd prefer a phone-free celebration. Don't worry about missing "the" shot—the couple hired a photographer for a reason, and if you're trying to document every big moment on your phone, you're probably going to be in their way.
Raising concerns with the couple.
Got lost on your way to the ceremony? Sitting in traffic and worried you might be late? Don't call or text the bride or groom. They'll be busy getting ready and taking pictures, and they shouldn't have to worry about any issues involving guests. Instead, contact the maid of honor, best man, another guest, or the couple's wedding planner.
Switching seats at the reception.
Never try to switch assigned seats at the reception, even if you're unhappy with the location. The bride and groom spent hours planning their seating chart, and having you change locations will throw everything off. Remember that you'll only be sitting during dinner—you can make it through an hour sitting with anyone.
Giving an unexpected toast.
Unless the bride or groom has asked you to give a toast, don't clink your glass and command the room. The couple likely put much thought into their toasts, and an impromptu speech will rub them the wrong way.
Requesting a song.
If the DJ asks for song requests, go for it! But if not, don't ask him to play a particular song, since the couple may have a predetermined playlist.
Food for thought??? Let us know what you think about the information above.