Advice on Constructing a Cost-Effective 20x40 ft Temporary Shelter

[Elsa Manatad]

I’m planning to organize an upcoming event and need to build a temporary structure that measures 20ft x 40ft, with a height of either 20 or 30ft. I’m considering using materials such as wood, PVC, conduit, or metal pipes, combined with canvas, tarp, or plastic for the covering. Ensuring that the structure is rainproof is a priority. How can i figure out cost?

Could anyone provide advice on the most cost-effective way to construct this and tips on estimating the total cost?