Question: Which summer Olympic have the highest and lowest number of participants?
SQL: SELECT ( SELECT T1.games_name FROM games AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.games_id WHERE T1.season = 'Summer' GROUP BY T1.games_year ORDER BY COUNT(T2.person_id) DESC LIMIT 1 ) AS HIGHEST , ( SELECT T1.games_name FROM games AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.games_id WHERE T1.season = 'Summer' GROUP BY T1.games_year ORDER BY COUNT(T2.person_id) LIMIT 1 ) AS LOWEST