Backyard Theater Setup Advice

I would not buy a TV. I'd buy an inexpensive projector and screen and set it up out there when you want to use it. Keep it safe inside when you don't. There's no need to do anything like surround sound outside. Get three speakers and a receiver and set them up in an LCR array when you want to watch something. Where you house the receiver, cable box etc and how you get wires to the speakers are going to be your biggest challenge. That and dealing with a lot of light unless you only plan on using it when it's dark outside.

If you're not looking to actually set up a theater out there but instead this is more of a patio/porch thing I'd look at the advice given above.

This is going to a temporary thing that I would only put up for occasions - pool party, game etc.

What type of projector do you use? And, how do you go about getting the movies to the projector - streaming, download, blu ray?

Is this covered?

Sonos beam 4K tv all you need

PVC pipe frame, white bedsheet, and projector is what my neighbor uses