To find the volume of a square pyramid, you can use the formula:
\[ \text{Volume} = \frac{1}{3} \times \text{Base Area} \times \text{Height} \]
First, calculate the base area of the square pyramid. Since the base is a square, the area can be calculated as:
\[ \text{Base Area} = \text{side length}^2 = 9^2 = 81 \text{ square feet} \]
Now, plug the base area and the height into the volume formula:
\[ \text{Volume} = \frac{1}{3} \times 81 \times 6.5 \]
Calculating the product of \(81\) and \(6.5\):
\[ 81 \times 6.5 = 526.5 \]
Now, find the volume:
\[ \text{Volume} = \frac{1}{3} \times 526.5 = 175.5 \text{ cubic feet} \]
Therefore, the volume of the tent is
\[ \boxed{175.5} \text{ cubic feet.} \]