I dont know what you have been told or already know so here is a crash (pardon the pun) course.

As Ride leader, hold a pre ride talk. Tell the groupe that you want at least 3 or 4 bike lengths between you and the rest of them. Do not use road gaurds, if a light changes, stop for it. make sure all have a RT map.
this way if someone does get behind, they will know where your going.
*******If you have not thought of it, have a lined sheet of paper and a statement at the top releasing you from any liability that all must sign to do the ride.******

this is pretty standard for most large orginized rides. You or the entity holding the event will not be held responsible for any accidents or otherwise that happens during this event.

PS. remember if your doing 55 in front, the last guy of the groupe will be doing about 65+ to keep up. If the ladies are a regular bike club, then they will have a Tail Gunner. review basic hand signals. main ones being to pass and to single up and double back up. if they are riding, dont know how your state is, but STATE POLICE STAGERED. IS THE SAFEST. IT SHOULD LEAVE ENOUGH ROOM FOR BASIC ERROR ADJUSTMENTS. oops didnt mean to leave caps on.
any other questions, refer to this http://www.ridemyown.com/articles/safety/handsignals.shtml

hope this helps. the biggest one in my opinion is to make sure that the passing style is all agreen on. best is to signal your wanting to get in a lane, have it relayed back to the gunner and let the gunner secure the lane.then the pack can move over. either you firs and then all behind or the one in front of the gunner and up.

YOU'LL BE FINE. HAVE A GOOD TIME WITH IT!

CHEERS

Mal: "Y'all see the man hanging out of the spaceship with the really big gun?{ref, Jayne} Man's lookin' to kill some folk. So really, it's his will y'all should worry about thwarting."