The ideal size of a part tent depends on the number of guests along with a few other factors. For instance, if you have an estimated 80 guests, for seating only you will need a 20×40 tent for seating only. But for a tent with a bar and buffet you will need a 20×50 or 1000 sq ft tent and a dance floor of 12×15 inches. Likewise, for about 90 guests you will need a canvas party tent of 30×30 inches or 900 sq ft for seating only and 30×50 inches or 1500 sq ft with a dance floor and DJ. But if you are expecting 100 guests you will need 20×50 inches or 1000 sq ft tent for seating only and 40×40 inches or 1600 sq ft tent for dancing and DJ.