Unfortunately, I think you've missed both. Both places are still worth checking out though.
The Nine Dragon Waterfall is the biggest attraction in Luoping after the rape flowers, but it shouldn't be crowded, and it's a really nice day trip on a bike.
They're probably planting the terraces in Yuanyang now. Unless you're a really hardcore biker, you might want to do this area by car. I recommend going further in to Ailaoshan and checking out the pristine cloud forests. There is one hostel in old Yuanyang, I believe it's called something like "Backpacker Guest House" or something. There's a Hong Konger there by the name of Tim who can tell you where all the market days and cool spots are, as well as help arrange cars.
That sounds like a plan. Showing at the museum will be a way to share with the people who helped make that happen.
Contact me when you have a chance (x i e f e i l a g a (at) g m a i l (dot) c o m), and we'll set up a screening at Yuansheng Theater. They can play DVD's, and have two projectors, one in the theater and one in the courtyard, when the weather is nice.
In terms of protecting the film, we'll just have to keep our eyes out for cameras.
First, the screening room sounds a bit small. You can comfortably fit about 50 at the Yuansheng Theatre in the Loft, and I'm sure they'd be happy to have you. I can help set that up.
Second, the 21st is opening day for the Yunfest Documentary Film Festival, which is where I suspect many of your potential viewers will be. Perhaps you could push it back a week?