CREATE TABLE table_80167 ("School" TEXT, "Location" TEXT, "Mascot" TEXT, "County" TEXT, "Joined" TEXT, "Previous Conference" TEXT, "Left" TEXT, "Conference joined" TEXT)

When doeas Mascot of blue devils in Gary Froebel School?
SELECT "Joined" FROM table_80167 WHERE "Mascot" = 'blue devils'
SELECT "Joined" FROM "table_80167" WHERE "Mascot" = 'blue devils'