Well we do get a little off topic.

I camp to hear stage music, and to pick (guitar) and sing around the campfire until the wee small hours, and to enjoy the company of old and new friends.
And to PARTY -- with no closing time or need for a designated driver.

Anyway, I found some mirrored plastic panels at US Plastics. Size 12” x 24”. A few of them strung together ought to do it.