Like the other times, I'll bring a couple of sawhorses with hanging steel plates (7x14" railroad plates). They make a nice sound when hit, can take a fair amount of punishing (50 cal excluded), and are safe to shoot at (I have shot literally thousands of 5.56x45 and 7.62x39 at them at 50 yds with no problems).
I was planning on having one at 50 yds, and the other at 100 yds.
If people are still too squimish at shooting them at 50 yds then both can go at 100 yds. But it's fun to rapid-fire a steel plate, and actually hit the thing. And it's actually safe (swinging plates, NOT rigid).
I'll also bring a small spinning steel target for handguns.
And small spinners for .22 LR.
And bowling pins.
And wooden blocks.
I feel sorry for the sawhorses, however. They will not survive...