There is ample security inside and out. Outside they move you along and give specific instructions before you enter, there you go thru a metal detector and you may be wanded. Also the NYPD had dogs outside on that day. Also dress code casual or you can dress up, it's up to you.
There isn't dress code, but I suggest you a nice dress in accordance with the event; metal detectors and bag check at entrance. Kind people in general.
Metal detectors, bag check, no outside drinks
They will check your bags and there is the a metal detector. As for dress, there is no real dress code but it is always good to look nice. You can always call or check out their website as well
Security just checks your bag (mostly) and a typical metal detector. I like to dress nice but not formal, I don't know, something about jeans and a t-shirt here doesn't feel right, but that doesn't mean you won't see it.
Arrive at least an hour early to have bags checked. The smaller the better. There is no regulations for attire but dress appropriate for the event. You can also see FAQ at this link: https://www.msg.com/radio-city-music-hall/faqs?icmp=int-radio-city_vlp-benefits_faqs
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