I just called the office. Printing out your reservation confirmation email and having it with you is fine.
Also, in case it isn't obvious, chances are high that this year won't exactly be an overly organized "Winter Hang" in the same way it has been in past years. Most sites are booked, and there will be a bunch of folks in hammocks out enjoying the woods for the weekend, but don't count on a large group cooking area (unless people feel moved to set one up), no cooking competition, no raffle, or any other formal stuff like that.
My recommendation (for what it's worth) is to come prepared to fend for yourself, and I guess we'll see what develops from there.
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