I am planning on doing the same here. I will ride hard on Saturday and prefer a lighter ride on Sunday. I will meet up with everyone at the same spot or along the route.
I am on doing the Suncoast Trinity 46 mile ride on Saturday. Planning on trying the B+ to the break and either ride the B+ back or drop back to the B depending on how I feel.
The B+ and the A group kind of merged last week after a couple of miles. The pace ranged between 24-30 mph depending upon the road we were on. I stayed with the group the entire ride which was perhaps my best ride ever. I had never rode that hard for that long in my life. It took 3 days of recovery but worth it.