Laurie,
First off I think you will be fine. (I'm sure Soren has told that numerous times already.)
Second, If it is going to be like all TRAP rides I've been on, everyone goes at their own pace, correct? Have points along the way where you pull over and get a head count, so you don't lose anyone, especially if you have any inexperienced riders with you. If you have some more experienced (and perhaps faster) riders let them know where to wait until the whole group has caught up.
If you are tense you shouldn't have your daughter on the back, being mentally distracted can cause mistakes you normally wouldn't make.
Do you have an idea yet, on how many ladies are showing up? Maybe, if there is someone you know, you could have a co-leader to take some of the pressure off. Just a thought.
Relax and have fun, you are way over thinking this.
