Advice on Low-Cost Projection Screen Backdrop and Mekanism That Releases

Hi There,

I'm new to your forum and very curious if anyone has any low-cost ideas on how to have a front projected fabric screen that would cover the front of a 27' x 10' stage and that can be quickly "released" to drop to the floor once a video is done playing.

See a video reference at the 2:27 mark (drops at 2:30) - https://www.youtube.com/watch?v=7oN3tefQLdg&t=2373s

What kind of mechanism should I look for that would probably attach to the lighting grid and would allow us to release the fabric/screen to start the show? I don't have much more access to the lighting rig/grid yet - but attached the plot that I have. Ideally would be a rental in the Los Angeles area.

Thank you for your assistance