CREATE TABLE table_52227 ("Date" TEXT, "Opponent" TEXT, "Score" TEXT, "Loss" TEXT, "Save" TEXT, "Attendance" FLOAT, "Record" TEXT)

What was the Attendance on April 28?
SELECT SUM("Attendance") FROM table_52227 WHERE "Date" = 'april 28'
SELECT SUM("Attendance") FROM "table_52227" WHERE "Date" = 'april 28'