Watch your language. Folks will jump on you if you say anything politically incorrect. Also be prepared for someone to get in your face and give you a lecture if you do anything they think is irresponsible...I once had a guy flip me a bunch of shit because I took 2 of the free samples at the gocery store.
Other than that you should be safe for the weekend. If you want to get in touch with the true freaky side of Boulder you need to try to rent a room in a shared house in Boulder. I lived in one house with this guy who apon hearing that I was a climber infomed me that his nickname was, "Teton Ron," because he'd climbed the Grand 5 times. A few months later I came home and he was hanging out with some friend. (Key to this story is I had gotten in a wreck and I was fighting with insurance and my truck was fucked up)
TR: Hey Kurt this is my friend xxx
Me: Nice to meet you
TR: xxx does body work
Me: Cool, you should go look at my truck it's fucked up and I need bids on getting it fixed.
TR: Kurt I ment massage therapy when I said body work.
Me: Huh, well I don't need any of that.
If you want to go totally native you should walk around The Hill wearing all your rock gear. Stop by a coffee shop and get some espresso and tell folks your headed to the Flat Irons.