I don't know what the group riding experience level for all the riders will be, but I would like to share one simple rule for group riding (street and dirt).
Keep track of the rider behind you!!
This generally means waiting at each intersection/turn until you see the rider behind you and you KNOW that rider has seen you!! The idea is that no matter how spread out the group gets, you don't lose people. If you have been riding for quite a while and have not seen the person behind you, stop and wait a minute. If you still don't see them, GO BACK. IF there is a problem, this should ideally result in the entire group coming back to the point of trouble so everyone can figure out what needs to be done to take care of the rider/bike having trouble.
The other benefit of this rule is that each rider should realize they WILL NOT get left behind and should therefor run at a pace they are comfortable with. I hate seeing an inexperienced rider trying to keep up with faster riders only to get in over his/her head and then having an accident and potentially tearing up the bike and/or body!
Having led a lot of rides, I know from experience that the worst people about ignoring this rule are the 2-3 people right behind the leader. I have often had to repeatedly stop and tell them to wait for the rider behind them because they want to take off with the leader the moment he/she goes.
If folks can follow this one simple rule, it makes the ride better for everyone in the group.
Okay, I lied, TWO rules, or really a sub rule to rule #1
IF you decide to drop off of your group, let someone know.
I cannot tell you how many times I have been leading a ride and riders have decided to peel off and go their separate way without letting anyone else in the group know what they were doing. If everyone is following rule #1, this is a real pain!! It makes people wonder if there is a problem. I have literally spent hours in the rain with other riders looking for a missing rider only to eventually give up and find him back at the hotel enjoying a cold beer... Needless to say, he was not real popular with the rest of the group that evening...
It is real simple, get the attention of the rider in front of or behind you, stop and actually SPEAK to him to let him know you are bugging out. Don't just assume he knows what your head bobbing and arm waving mean if you are trying to let him know your intentions without using actual words
This last issue is not a rule per se, but more of a courtesy issue. If you are a group leader and you stop to wait for the whole group to reassemble, don't take off the second the last rider shows up. Everyone else has had a few moments to sit, rest, maybe talk, and/or take care of any little issue they might be having. Give that last rider the courtesy of having a minute or two before you take off again. I promise that rider will appreciate it! I usually check with the last rider before I head out again if I am leading.
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This was not an enjoyable ride and my friend said he would never do that again
. So I will make sure my group follows the basic rules or common courtesy of your fellow rider. 
Of course you know, pay backs ARE an exwife.
