Shopping for the Dress
If you are invited to come shop for the bride's wedding dress, of course go. When you're shopping for clothes, keep an open mind. Sure, you think you know what looks best on you, but someone else might have a different idea about what works best on her. If you go into this with an open mind, your opinions about what looks good on her might change over time as she grows more comfortable in her bridal gown. Maybe she'll love a different style by the end of the day than she did at the beginning of the day. Maybe one of those dresses, in your opinion, was completely perfect, and now it looks awful. The point is that if you remember to be supportive instead of critical, your friend may walk out of that store feeling more confident than she did when she stepped through those doors.
Offer to Help!
Most people are hesitant when it comes to asking for help. Chances are the bride has a lot to do. You could offer to do something as simple as mailing the invitations. Your offer may be declined, but it will be much appreciated that you even asked. As an important person in her life, you should want to make her life a little easier.
Be the Life of the Party!
At the wedding, encourage everyone to get up and dance! It's no fun if everyone is sitting while there is a party going on. You need to be one of the first ones to get up and start. The party needs to be great for the bride. Make sure everyone has fun. It's important that everyone has a good time at the wedding, whether it's your role or not. Make time early on to get people excited and engaged, even if it means doing something silly or putting everyone in a good mood before the big ceremony! Of course, stay out of trouble!