That's what I was saying.... You can often search and see if there are any special interest groups, but there's no way of finding all the groups on a particular sailing. The cruise lines won't release that information for privacy reasons. Every sailing will have groups of all shapes and sizes, just no way of knowing who or what size.
46 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!