Fred:
I do not see any problem with having a get together on an RSSC ship. On my past cruise aboard the Mariner, there were about 6 couples on board, and there was a group of 8 of us that got together for dinner and/or drinks on a few occassions. With the open dining and the butler service in alot of the suites, this is very easy to do.
I have noticed that some of the gay travel agencies, such as David Tours, have been organizing trips on the Radisson ships. I am sure that they are well received, or they would not be promoting the cruise line. I just checked the David Tours website, and their trip to the Baltics is the end of July on Voyager. Maybe you could get some feedback from that group.
Good luck!
John