I think the best way to find out would be to call DC. Or ask when you check in, and if they say no, then it is no. I don't see why they would care. But the dolphin swim and planning takes up a large part of the day. You need to report to your assigned area by a certain time. Then they go through a movie and other information. Then you do the swim. Then go look at your photos. It breaks up the day enough as it is. To break it up twice just takes away more time from the other areas. Having been to DC several times, the dolphin swim was not the highlight of the trip for us. It was enjoying the rest of the park that keeps us coming back. This year, we are not even doing the dolphin swim.