The A1, A2, etc, are the actual rides that people will be doing. Everyone will be doing a ride on Friday and a different one on Saturday. So, say your group runs A1 on Friday, they might do A3 on Saturday.
I've got everyone divided up into smaller groups and the spot you are in the current list doesn't have anything to do with it. Based on what I know of you all, I have tried to group people together with a couple that have wheeled together before, as well as with a few that haven't wheeled together. I thought about posting up the groups but as people add and drop, it will be confusing to try and keep that updated as well. Upon arrival and check in, I will make sure everyone knows what rides they are doing, as well as who their group leader will be.