(I'm just updating old posts that I've asked questions on... and found answers the hard way) We pulled an average of square feet/person for our lines. Our rows are 4' wide, and people stand in bunches. I think we could do better line management if people are in a single file line at 2, or 2.5' wide. But we figure that each guest will take approx 8 square feet. Sounds high... but do the math.