Upgrading from Nikon D90?

I currently shoot with a Nikon D90 (raw, manual, usually with a 50mm f1.4 or 35mm 1.8, primarily people). I am looking to upgrade to something with better high ISO capability and more focusing ability (for example, I feel like I have to up the f stop too much to achieve focus on more than one eye). $1500 is the top end of my budget. I am looking at the D7200, although the D7100 has also interested me since the D7200 has lowered it's price. I have done some review research but was looking for "real life" advice.

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Can I bring a DSLR into The Greek Theatre?

I'm going to a concert next week at The Greek Theatre in Los Angeles, and I want to bring in a camera. The only camera I have is a DSLR (a Nikon D3200). It's a smallish camera (for a DSLR), and I will have a prime lens on, but I'm afraid it is too 'professional' looking. I know the venue says no cameras with a detachable lens are allowed, but I've been to others venues that have stated that and there are TONS of people that still bring them in. What would they do if I still tried to bring it in? Has anyone ever been stopped and turned away because of it?

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Best gear for taking sports photography?

Best gear, as in camera, lens, anything with that. Canon or Nikon?

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Best lens for surf photography? - 1

I've asked before, but I forgot to add a lot of detail.
I've been looking at the Tamron 70-300mm f/4, but I feel like it's *too cheap*. Any other lenses around that price range, up to 100$ more?
BTW, I shoot Nikon D3200.

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Soligor to Nikon Adapter?

I need an adapter for these lens so I can use them with my Nikon D5000 if possible.

Soligor C/D ZOOM+MACRO 80-200mm lens
Auto Aubell f = 28mm lens
SMC Pentax-M 50mm

Are there any adapters that will work for any of them? Any help or information would be great! Thanks ahead! =D

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Why won't my camera turn on?

I was just in the middle of taking some photos, when my camera went off. I left it for a while, tried again and then it turned on. But the next day it wouldn't turn on at all. I have a spare battery and made sure both were charged, and tried both. I've removed SD card and lens, nothing. Normally when you remove lens or SD card a light flashes (provided battery is in), and that didn't happen. I've checked the battery contacts and they're clean.
My camera is (was?) a Nikon D3200.

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