(is) anything going on?
Is anything interesting happening? A: "Anything going on?" B: "Nah, it's a pretty boring night." What are you doing today? Is anything going on?
(Is) anything going on?
Inf. Is there anything exciting or interesting happening here? Andrew: Hey, man! Anything going on? Henry: No. This place is dull as can be. Bob: Come in, Tom. Tom: Is anything going on? Bob: No. You've come on a very ordinary day.