CREATE TABLE table_201_18 (id DECIMAL, "date" TEXT, "event" TEXT, "headline act ( s ) " TEXT, "supporting act ( s ) " TEXT)

which month is the most popular month for concerts at the old trafford cricket ground ?
SELECT "date" FROM table_201_18 GROUP BY "date" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "date" FROM "table_201_18" GROUP BY "date" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1