I just set up a mixology session for our sailing 2/22. After contacting DCL, I was asked to provide names of each person 21+ attending, along with their stateroom # or reservation #. Names and #'s must be submitted at least 30-45 days prior to your cruise date. Each person will be charged $15 regardless of showing up for the event. Max per session is 30 people so we broke our group into 2. DCL communicated with me about this via e-mail and phone conversations. Everything was finalized at 45 days out for us and I was given the location of where our mixology session would be held. It's a super simple process with DCL, the hardest thing was getting everyones names & stateroom or ressie #! Good luck and have fun!