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This will be my first time ever going to an anime convention. I have a few questions regarding the event. Thanks in advance!!!

1. Do I really need to get a registration badge if I just want to walk around inside?
2. I maybe only interested in the dealers hall since I want to shop/browse for items would I need to register and get the badge in order to do so?
3.What are the pros/cons of getting a badge and not getting a badge(registering)