This may be obvious, but I'll say it anyway:
Pot up the biggest, fastest-growing seedlings first. Those are your best plants - keep them!
When you have as many yogurt cups filled as you have room for, leave the rest in their 72-cells or harden them off outside with whatever cover and warmth you have available. If any survive, plant them and "mess up" the root-bound root-ball (meatball root pruning) as you plant out. The extras may or may not do much.
Alternatively, depending on your neighbors, offer them some of the slower 72-cell seedlings to pot up.
