We had an art donation earlier this last year involving specific chosen employees who have displayed adequate skills. Of these employees there has been several who have far above average skills (I believe they will actually sell something) and of one of those employees, is even far above that and is a celebrity in the art world. I am not entirely sure why he works here as he clearly doesn't have to work.
After we had finished setting up the show and with less than two days before it begun, our artistic genius throws a giant tantrum and goes on about how nobody truely understands him or something. The day of the show, maybe one hour before he starts, he replaced all of his pieces with trash glued to a plate. These was common items found around the office like a crushed coffee cup and some wrappers. He then named these pieces after us, but in a very clever way that doesn't directly say it. Needless to say, there were a lot of people who were hurt at his mockery of the donation drive and even more hurt as someone actually paid $200 for what is essentially trash.
We plan on having another one of these donation art shows and I want to know how can I prevent these things from ever happening again (the run away diva)? As much as I want to flat our ban him from attending, wealthy people are flying in from other states to meet with him and see his work.