Show the names of people that are on affirmative side of debates with number of audience bigger than 200.
SELECT T3.Name FROM debate_people AS T1 JOIN debate AS T2 ON T1.Debate_ID  =  T2.Debate_ID JOIN people AS T3 ON T1.Affirmative  =  T3.People_ID WHERE T2.Num_of_Audience  >  200
affirmative side refers to Affirmative column matching with People_ID; number of audience bigger than 200 refers to Num_of_Audience > 200; names of people refers to selecting Name from people table;