Charlize Theron -- $50,000-a-Table Oscars Party ... Total Disaster

It cost $50,000 per table -- but sources tell TMZ, the post-Oscars party benefiting Charlize Theron's charity was a MASSIVE disaster ... overrun by trashy party crashers, cold food, weed smoke, and disgusting port-a-potties.

The event was called Fame & Philanthropy and took place at The Vineyard Beverly Hills, benefiting Charlize's Africa Outreach Project and two other charities CITY and the Compound Foundation.

It was supposed to be a sophisticated gala affair -- but sources at the party tell us, once the ticket-scanning system broke down ... and uninvited guests began to spill in ... the party spiraled into chaos.

We're told the caterer couldn't keep up and was serving out cold mashed potatoes and wings, pita bread, hummus, noodle dishes -- whatever they had -- and the musical guests (Ne-Yo, Paris Hilton, and the Stafford Brothers) got WAY rowdier than organizers expected.

If that wasn't bad enough, we're told the port-a-potties quickly became gag-inducing dens of filth -- oh yeah, and the TP ran out.

Spilled drinks, messy tables, weed, drunk people everywhere -- one source tells us it felt like Vegas on a bad night. And when all was said and done, there weren't enough shuttles to ferry the ACTUAL guests back to their hotels.

We reached out to a rep for the Fame & Philanthropy people -- so far, no word back.