This may not be a common practice within the Muslim community, but perhaps, it should be. A lot of time, effort, and planning go into a wedding and it’s almost impossible to do on your own. Many of us may require help from family and friends. Those people should receive some sort of gift for all of their hard work. It doesn’t have to be something big, just a token of your appreciation.
We often see brides put together a gift basket for their bridesmaids. This is almost the same concept. You also want to make sure you gift your parents.