The weekend club rides that I participate in are very organized, with Dan Henry's, maps and/or cue sheets and ride leader contact cell # on the map/cue sheet. No discussion of A, B or C but a variety of folks show up and the expectation is that the fast group will go first and will go fast. Ride leader usually asks if any newcomers are present and arranges for someone to be their mentor on the ride. There are usually 3 or 4 length options.
The ride I rode yesterday, on the other hand, was a club-associated 'Grand Touring' ride, smaller turnout as it was outside the metro area, and everybody rode together. No Dan Henry's but a map in case of someone straying off. Ride leader kept track of everybody, called out turns and provided invaluable info about road conditions and sketchy bits to expect. The group stopped for lunch and another break. Not a go-fast ride but we had a good pace.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer