For any special event, it is wise to be on your best behavior and don your finest attire for the occasion. Depending on the occasion, you must follow the proper protocol to be on the good graces of the bride and groom and other important figures and if you want to continue to be invited to other functions they will host.
During the ceremony, cell phones or any electronics need to be on vibrate, silent or completely shut off. Unless that call is an emergency, do not answer it and leave the ceremony site if you need to talk on your cell phone.
Way to draw attention to yourself. Not only will you be getting the evil eye from the other guests, but the officiant and bridal party too. Worse, they will hear your not so private conversation.
Some couples choose not to include children on the guest list for various reasons: budget, capacity restrictions or because of the behavior. If the bride and groom wish to include children on the guest list, there are a few things parents must follow with small children and . During the ceremony, instruct the child to keep quiet and sit still. That can be a hard feat for children, but one way to keep them busy, quiet and happy is to bring coloring books or a pad of paper for them to doodle on . As for potty breaks, instruct the child to whisper to you when they need to go, so there are no loud interruptions during the ceremony. It's okay to let your child play at the reception, but keep a watchful eye so they won't cause trouble.
It's bad enough to hear a cellphone go off, but it's worse with children. Even a fellow parent would give the death glare if another parent can't keep little precious quiet.
Babies are a different story, but proper etiquette still must be followed. If the baby starts to cry, quietly excuse yourself from the ceremony and go to another room to soothe the baby.
Nothing is more piercing to the ears than a loud baby.
Having a drink or two is okay, provided that you are on your best behavior and not causing a scene. Some can tolerate alcohol more than others, but the bad behavior that comes with it is the intolerable part for anyone with an inebriated guest.
The hangover won't be the only thing she'll be regretting in the morning.
Lewd or crude remarks, verbal or physical fights, harassment, or loose inhibitions like blurting out that the groom once slept with some strippers while you're drunk are bound to haunt you. That haunting may result in you being snubbed from future events or ruining whatever relationship you have with your fellow guests and/or the bride and groom.
Moral of the story: Tactfulness get you anywhere.