Use this size guidelines to estimate the tent size; Stand-Up Cocktail-Style 6 sq. ft. per person, Cocktail-Style with some seating 8 sq. ft. per person, Tea-Style Reception with some seating 8 sq. ft. per person, and Dinner, seated at 8' Banquet Tables 10 sq. ft. per person. Multiply 50 guests by the number of square feet appropriate for the party and get the size. http://www.ehow.com/facts_6763694_party-tent-size-information.html has more on this.