Here are some guidelines to help you choose your tent size.
Cocktail Parties (standing room only) 6 sq ft per person
Buffet Dinner 8 sq ft per person
Sit Down Dinner 10 sq ft per person
Cathedral Seating (Concert or Revival type) 6 sq ft per person
Dance Floor 5 sq ft per dancer
Live Band (Consult Band for exact size needed) 300 sq ft
Thecapacity chart link is for guests seating and does not take into consideration space for other needs, such as dance floor & stage for band. Use the space guidelines above to create a total square footage requirement for your event.