I have three daughters who are married. During the process, I learned that it is accepted that guests have up to a year after the wedding to give a gift. I also learned that gifts should NOT be brought to the wedding so that the bride and groom do not have to worry about handling the gifts after the ceremony and reception. After all, it is not a birthday party or shower where gifts are opened on the spot. If you feel that you must do something on the day of the event, your idea of the pillowcases is a good one, but then could you use the time making the pillowcases to work on the quilt?If it were me, I would simply finish the quilt in the next few weeks and give it to them when finished.