It depends on the local ASC, but generally there's not an issue if you just walk in with your appointment notice and ID and ask them to do it then. No golden key necessary. I'd suggest doing this sooner rather than later in case there are any problems. Wouldn't want to ruin your vacation!
You have to either reschedule your planned vacation (which I recommend) or reschedule your AOS case processing which would delay your case and potentially place you in a slow moving track. The choice if yours, of course.
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You can try going to the ASC with your appointment notice and see if they can assist you sooner. However, since it won't be your scheduled appointment time, they could refuse. If possible you should go sometime in the next few days. That way if they cannot assist you, you still have time to contact USCIS and reschedule your appointment for sometime after your vacation.
There is certainly no harm trying to get it done earlier by going to the application support center and asking them. You may be able to go to an ASC in the place where you are vacationing as well.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.