The FE group we are a part of for our cruise has multiple groups to join. They have "Guppie" groups for those new to FE exchange with only 5 families each, regular groups with 10 families each, a magnet, ornament, recipe and beer exchange groups as well. Since this is our last cruise for awhile my DD really wanted to be involved so we joined 2 regular groups and the ornament exchange. Usually the creator of the exchange will post some rules for the group so check there first.
There are multiple places to find FE groups. Check the Meet and Great group here first. There are probably other groups for your cruise on other sites if you belong to social media.