I went on a large group ride recently, here are 5 things I walked away with as important things to think through before going on a group ride.
1. Learn hand/foot signals
2. Ride something you're comfortable with & enough power for the group
3. Ride your own ride & research the group style beforehand
4. Pick a reasonable spot
5. Be ok with not hearing your engine.
Let me know what other things you wish you knew before your first big group ride.