CREATE TABLE table_204_276 (id DECIMAL, "record" TEXT, "date" TEXT, "result" TEXT, "opponent" TEXT, "location" TEXT, "method" TEXT, "round" DECIMAL)

which location is listed the most according to this chart ?
SELECT "location" FROM table_204_276 GROUP BY "location" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "location" FROM "table_204_276" GROUP BY "location" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1