The key up there is to communicate. Say hello, ask how the guys are doing, and if they don't mind you slipping into a gap. Shoulder to shoulder is probably an exaggeration, though the well known holes get crowded, even during the later brown run. Watch how the guys around you are drifting, and follow the cadence. For the most part, there's fish for everyone, and when you hook up, everyone gets excited. Just don't be the guy with the UL and 4# line chasing a fish up and down the river to keep it from spooling you, lol. Everyone hates that guy. Have fun man, it's a blast.