What is the etiquette for joining groups of cyclists that you don't know?
Join in, hang on. Don't get in the way. If you're fast enough to do a bit on the front, do so. If not, hang back. Signal intention when moving round people/moving off the front. Make cycling up the drag look effortless while everyone around you slowly falls apart. Don't let dickheads with tri bars draft you; they should be doing all the work on the front because whatever they're training for isn't draft legal.
Join in, hang on. Don't get in the way. If you're fast enough to do a bit on the front, do so. If not, hang back. Signal intention when moving round people/moving off the front. Make cycling up the drag look effortless while everyone around you slowly falls apart. Don't let dickheads with tri bars draft you; they should be doing all the work on the front because whatever they're training for isn't draft legal.
That sort of thing.