I have a question can I bring outside food in it well be in my bag

No

Clear small bags only.

Not usually depends on event. For concerts I've been to, very strict; no purses, backpacks, water, food. For sporting events may be different. They have food and drink vendors. No open containers or packaging. Empty water bottles are ok. Clear bag policy; gallon.

Yes but it has too be in a clear plastic bag.

Don't honestly know, maybe check their website.