I found, as a tech, corporate events are the worst for these kind of scenarios. Drunk suits getting onstage and falling off injuring themselves always brings out the H&S guys. I've seen sets collapsing, drink spilled over equipment, and rude, drunk people shouting at you that their white wine is warm, mistaking you for waiting staff. As a freelancer, I had PLI in place and the risk assessments I've seen for working in some venues look like Tolstoy's War and Peace.
I don't do corp gigs any more, TF!