Elaborate weddings are back in style, creating etiquette anxiety, but do not fear--Miss Manners is here to give you the dos and don'ts of the day.          With weddings today resembling a hybrid of the Academy Awards, the Super Bowl, and the Miss America Pageant--and brides running roughshod over loved ones in their quests for a Perfect Day--everyone involved needs a handbook of wedding etiquette to get through the big event with dignity, families, and finances intact. Here is the final word: Miss Manners on Weddings. This classic guide to wedding etiquette sets out the real obligations and responsibilities of the friends and family of the couple, from the mother of the bride and the maid of honor to the ushers and the bride's father's girlfriend. In her trademark witty, authoritative voice, Miss Manners lays down the law on the complete range of subjects: the engagement, the shower, the invitations, the gifts, the reception--an approach that will make weddings more pleasant for one and all, even the bride.