If I knew that you were registered, I would feel obligated to bring a gift - BUT, I wouldn't attend a housewarming party emptyhanded anyways, and I like to get people things that I think they can actually use or need. If you do register, just make sure you put some lower cost items on the registry for those who want to celebrate with you, but maybe can't afford an expensive gift.
Congrats on the new townhouse btw! |