A Real Picnic - The blizzard of '78 has been no picnic. But the boys at University of Michigan's Phi Delta Theta fraternity didn't think that should prevent a "beach party". The hardy bunch, reclining above [this photo], in lawn chairs around their make-shift beach outside the Carriage House at 1224 Washtenaw Court, had one comment Thursday. "More beer." Meanwhile outside the dorms nearby, students created small blizzards of their own playing football in the two-foot drifts of snow. Technically, U-M classes weren't canceled until Friday afternoon but teacher and student absenteeism ran high both Thursday and Friday. Classes are supposed to resume Monday.