How to decide the size of marquee?

I want to buy a marquee for my daughter's birthday party. But i don't know how big i should buy, I have googled it, but i found so many articles about it, i don't know which one is the right answer. I hope some experienced people can give me some suggetions. Thank you very much.

?2012-02-23T06:25:47Z

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In fact, I don't have the exact answer to your question, because the size of your marquee depends on some aspects of your daugter's birthday party. There are some tips about your problem, hope they can help you. These tips are as followed:
1. Estimate the number of your guests will take part in the birthday party and you’d better allow a margin of error for guests who maybe can’t get there.

2. Because different type of seating needs different room, so determine the type of seating. Generally, we think each gust needs about 8 square feet of tent space to move around comfortably, if it is a sit-down party banquet, it will be 12 square feet.
Hope this answer can help you.