Consider an open casting audition as the lottery ticket. If you don't participate in the game, you're not going to take home a prize. This is the same for casting open calls. If you do not show at all, you're not likely to obtain the role!
You're given the same chance as the person else in the audition stage to win the role and live one of your goals. Everyone who attends the audition has the same level and shouldn't worry about someone else's huge portfolio they're displaying in the open room. To get more information about casting auditions, you may see it here.
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If the casting directors did not ask that you bring additional videos or photos or other materials, you're just carrying something around that is likely to never be viewed and could cause a mess.
The only thing you need to ensure your headshot is. The majority of headshots will feature an image of your head on the front, and the most recent resume information in the rear. The information you provide on your resume in an open audition could include credits for performing or training as well as your capabilities.
Be truthful about the work you've completed. In an audition, lying about what you can do will waste time and energy and could result in the last audition you're invited to. Keep in mind that everyone is busy and time is money in the film industry.