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It is perfectly acceptable for you to find the ROLL CALL for your sailing and post looking for others to share your tour. However, I think you would get a much better response if you would take some time to participate, and get to know the other members sailing with you. That is what Cruise Critic is all about. It isn't a ad site where you can find others to tour with you, but rather a place to make new friends.
After you spend some time reading the thread you'll get to know some of your fellow passengers. You may even find that you'd like to join a tour THEY have set up!
Just like the real world, there will be people you will click with immediately, and some you won't. Why be stuck on a tour with someone you don't even know? Do yourself a favor, get to know the people on your ROLL CALL before you ask them to join your tour.
With regard to the specifics of contact, my suggestion would be for members to contact the tour operator directly, once they have decided to do so. There are other ways, but to me that is the safest for you.