the party starts at 9, the first guests will start arriving around 10, and it should be winding up by 11:30 or so
just getting into the meat of the party/event, where everyone is a little buzzed, spirits are high and anything might happen
"the party starts at 9, the first guests will start arriving around 10, and it should be winding up by 11:30 or so" What is the definition of "winding up"?