The MSF, GWRRA, and others have guidelines for group riding that are designed to ensure the group ride is first and foremost, SAFE. An unsafe ride is not fun, especially if someone crashes. First, a group needs to have a leader at the front and a tail gunner at the rear and have a means to communicate via radio. The group should be no more than 6 to 7 bikes. If the group is larger than about 13 or 14 it needs to be split into two smaller groups. The groups need to stay far enough apart to allow cars to pass and return to the lane in between the groups. The riders in a group need to stay close enough together to restrict cars from passing and inserting themselves between bikes. The riders should stay 1 to 2 seconds apart when in staggered formation and 2 to 3 seconds apart when in single file. Use staggered formation on the straight stretches and single file in the twisties. Staggered doesn't always work with trikes. The riders need to stay close enough so that hand signals from any one rider can be seen and repeated by the rider in front and particularly behind. The group should never try to ride faster than what the slowest rider is comfortable with. This may mean that there needs to be two or more separate groups each traveling at the speed they want with a clear understanding where they will all meet up periodically along the way and at the end.
There is a critical need for group riding training in the Spyder riders community. Group riding MUST NOT be a hap hazard gathering of bikes speeding along the highway. If you get into one get out as soon as you can and ride safely by yourself.
I agree with everything said above. IF riding as a group, then ALL the above guidelines need to be followed meticulously. The problem is, they're not. In my experience, group rides with clubs and on rallies generally adhere to the guidelines, but; a) some guidelines, such as max group size of 7, are routinely ignored and b) the group will set off assuming that all participants are familiar with and committed to following ALL the rules without ensuring they do.
Given this, in my humble opinion, it is better to abandon any attempt to keep riders together on a ride and instead let each person ride their own ride, with periodic planned stops to reconnoiter, have lunch together and ensure everyone is okay. The leader's role then becomes to pick the best route, provide written directions and set a safe, steady pace. The sweep (who should be in contact with the leader periodically) is there to watch out for stragglers, folks who have a technical problem, etc.