CREATE TABLE table_204_658 (id DECIMAL, "week" DECIMAL, "date" TEXT, "kickoff" TEXT, "opponent" TEXT, "results\ final score" TEXT, "results\ team record" TEXT, "game site" TEXT, "attendance" DECIMAL)

who did this team play after the frankfurt galaxy on may 20 of this season ?
SELECT "opponent" FROM table_204_658 WHERE "date" > (SELECT "date" FROM table_204_658 WHERE "date" = 'sunday, may 20' AND "opponent" = 'frankfurt galaxy') ORDER BY "date" LIMIT 1
SELECT "opponent" FROM "table_204_658" WHERE "date" > (SELECT "date" FROM "table_204_658" WHERE "date" = 'sunday, may 20' AND "opponent" = 'frankfurt galaxy') ORDER BY "date" NULLS FIRST LIMIT 1