The old walnut tree?

Where shall we wed? We don't want a massively expensive "do", but something simple and elegant, honest and loving. Most of the "wedding venues" around town seem very commercial, and we were both left feeling rather overwhelmed by it all. Seemed so very commercial, like, if you didn't spend $XXXXXXXXXXX.XX then it wasn't done right or something. There must be another way? What about the walnut tree? In our backyard? OK so the garden is not perfect, but the house belonged to my Nana, and has very fond memories for me. Trouble is if it rains, we're screwed, cos the house is nowhere near large enough to accommodate everyone. More thought required....