You should consider just having a Swan reservation since your Dolphin reservation may be moved over to the Swan if the Dolphin is not open during your dates.I have the same concern about our December Dolphin stay now. And we booked the Dolphin as a back-up for our POFQ reservation that's unlikely to happen.
It is always easier to run a single 750 room hotel vs an additional 1500+ hotel without convention / company meeting bookings.
Dave