Simone,
As to whether you can get in, I went to the CES web site and found the following on a FAQ page, which I quote:
"If I have a badge, can I walk right into the show?
"No, each registrant who receives a badge by mail will need to go to a Badge Holder Pickup location to get their official International CES badge holder. Admittance without a badge holder is not permitted. International CES is a trade-only show and is not open to the general public; therefore, we must ensure all attendees are industry affiliates before issuing a badge holder. After the show, CES performs an official attendance audit through an outside auditing firm, and the on-site badge holder pickup process serves as a method for counting attendance.
Two forms of identification are required to pick up your badge holder:
One personal picture ID such as a driver's license or passport
One business ID such as a business card, pay stub or statement on company letterhead indicating that you are representing that company at International CES."
As I mentioned in my earlier post, I have heard that friendly dealers sometimes help non-industry people get in to the show, perhaps with the help of the company letterhead.