RSVP as soon as possible — the couple has decisions to make based on numbers. If you have to cancel, do that immediately, too.
Make dietary requests unless they have been solicited.
Feel obligated to bring a gift to the engagement party.
Ask the bride to be a bridesmaid. There may be circumstances beyond her control, so don’t take it personally if she doesn’t choose you.
Pester the happy couple with all of your prewedding questions. Ask members of the wedding party, or consult their wedding website.
Ask for help with your hotel bill. Even if you’re flying in from the opposite coast, the couple isn’t required to pay for it.
Purchase items from the gift registry and make selections based on your relationship with the couple.
Send a gift even if you can’t make the wedding.
Bring a guest unless the invitation specifically says you may do so — that includes children.
Wear white. Ivory is okay. So is black.
Bring your gift to the ceremony. You have up to one year to send something (although it’s best to send it as soon as possible after the wedding).
Wait for a cue from the wedding or venue coordinator if you are late and the processional or ceremony has already started.
Remember to turn off your cell phone during the ceremony.
Take photographs during the service — your flash may interfere with the professional photographer.
Remain respectful even if you do not take part in the religious ceremony.
Wait for the bride and groom to dance before you hit the floor, even if music is beckoning. The couple gets the honor of the first dance.
Just talk to your date. Engage the people at your table in polite conversation even if you don’t know them.
Write or call the bride and groom to ensure that your gift arrived safely if you have not received a thank-you within three months.