Wedding Etiquettes

RULES FOR THE HOSTS

If you don't want children at your wedding, you have 2 options, when addressing your invitations, leave the children's names off it and also don't mention them in the invitation.
Have friends and family pass the word around that you don't want children there.
If someone hasn't responded to your invitation, one week past the "Reply by" date, call him or her and confirm over the phone.
It is considered rude to put "cash only gifts", or other wording meaning the same thing on the invitation.
You're not required to open your gifts at the reception or in front of anyone.

RULES FOR THE GUESTS

If you are late for the ceremony, you should find a seat quickly and quietly.
You have to buy the couple a gift and the gift should be something that they can both use.
If you have sent a wedding gift through the mail, then you don't have to bring another one to the reception.
It's wise to give a cash gift to couples that are getting married out-of-town because they will have to ship everything back home and that's an added cost to them.

INDIAN WEDDING ETIQUETTES

Whatever you decide about your dress, dressing modestly is a must. That means no bare shoulders, plunging necklines and short skirts. For the Reception party you don't have to be so cautious and can go all out and wear the brightest colors and fanciest outfit with all the jewelry you own.
Generally wearing pure white and black are avoided during the wedding. White is worn at funerals, and black signifies mourning. Weddings are festive events, and bright colors are always welcome and considered auspicious at a joyous event. Try not to wear bright red as this is traditionally reserved for the bride and you shouldn't outshine her on her special day!
If there is no gift mentioned on the invitation, then it is perfectly acceptable to give a monetary gift to the couple at an Indian wedding. Usually this is done by placing money or vouchers with a card or a note into a pretty envelope or embroidered bag, along with best wishes to the couple. Numbers that end with numerical one are considered lucky, for instance, Rs.101, Rs.151, Rs.201, Rs.501, and so on.
It is not generally a custom for male guests to kiss or dance with the bride. Even the most liberated bride will follow the custom of being demure on her wedding day and it's best to respect tradition on this.