I made one a while back out of a sheet of cheap plywood, 3-2x4s and some saw horses I already had.
Cut a hole in the center a little smaller in diameter than the size of a big trash can and screwed the 2x's around the perimeter to add rigidity and create a lip so things wouldn't roll off. I then covered it with a thin plastic sheet and newspaper and everyone went to town. Cost me about $20 and had space for about 10-15 people.
All the trash got pushed or thrown in the center and the can could be slid out from underneath for bag changes. When we were finished I repurposed the wood for something else. No longterm storage required.
Of course, we were there to drink, eat a metric crap ton of mud bugs and celebrate the 1st year of my firstborn son with raucous merriment. Not sit around some overpriced card table like a bunch of dandies sipping mimosas after tennis lessons.
YMMV.