They call it a “dayger” (a daytime rager) and the one at Yale’s Sigma Nu last weekend was huge. Every surface of the frat house seemed coated with a sticky layer of spilled drinks and grime. Young Yale men, many wearing ties and jackets, others wearing much less, stumbled up stairs, gripping plastic jugs of generic booze. True to their fraternal creed, “To believe in the life of love,” the brothe