HELP !! dynamic mesh instanced ask?

I want to know how I can use dynamic instances, I have a scene of a stadium, with many lively people, and let me know how I can render the scene in real time. without my GPU down so much, I have 64 of ram, geforce gtx 980 ti 6gb, and my fps down to 10, someone who can advise me or tell me how I can use dynamic instances?